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ALASKA VOLCANO OBSERVATORY WEEKLY UPDATEFriday, May 24, 2013 11:38 AM (Friday, May 24, 2013 19:38 UTC)

PAVLOF VOLCANO (CAVW #1102-03-)
55°25'2" N 161°53'37" W, Summit Elevation 8261 ft (2518 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

The eruption of Pavlof continues, but at a lower level of activity than earlier in the week. Early in the week, continuous seismic tremor, intense elevated surface temperatures, and ash, gas and steam emissions characterized activity. A continuous plume of steam, ash, and gas, occasionally reaching up to 22,000 ft. above sea level but mostly below 15,000 ft., was observed in satellite images, by pilots, and observers on the ground in Cold Bay and Sand Point. Trace amounts of ash fall occurred in the community of Sand Point on May 18 and Nelson Lagoon on May 19-21. A lava flow advanced down the northwest flank, and lava fountaining was observed at the vent. Seismic tremor declined markedly on Wednesday morning and was replaced by small discrete explosions. The numbers and amplitude of these explosions have varied over the past several days. Cloudy conditions since Monday have hampered direct observation of the vent and ash plume but a pilot report and photos from Wednesday morning showed a very weak steam and gas plume with little to no ash issuing from the vent. Over the past day, distinct small explosion signals were detected on seismic instruments and pressure sensors and weak ash signal was detected in satellite images indicating that these small explosions contain minor amounts of ash at times.

During past eruptions of Pavlof, the style of eruptive activity fluctuated from higher to lower levels. Therefore, this apparent lower-level activity does not necessarily indicate that the eruption is ending. Although the activity to date has been characterized by relatively low-energy lava fountaining and ash emission, more energetic explosions could occur without warning that could place ash clouds above 20,000 ft. Depending on wind direction and strength, trace to minor ash fall may occur on local communities downwind. Information about mitigating the effects of volcanic ash can be found on the AVO web page.

Pavlof volcano is located on the southwestern end of the Alaska Peninsula. Pavlof is a stratovolcano which rises to an elevation of 8262 feet. With almost 40 historic eruptions, it is one of the most consistently active volcanos in the Aleutian arc. Eruptive activity is generally characterized by sporadic strombolian fountaining continuing for a several-month period. The community of Cold Bay is located 60 km (37 miles) to the southwest of Pavlof.

CLEVELAND VOLCANO (CAVW #1101-24-)
52°49'20" N 169°56'42" W, Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Elevated surface temperatures were observed in satellite images over the past week indicative of ongoing low-level activity. AVO has received no reports of ash emission or other indications of eruptive activity over the past 24 hours.

Sudden explosions of blocks and ash are possible with little or no warning. Ash clouds, if produced, could exceed 20,000 feet above sea level. If a large ash-producing event occurs, nearby seismic, infrasound, or volcanic lightning networks should alert AVO staff quickly. However, for some events, a delay of several hours is possible. Cleveland Volcano does not have a local seismic network and is monitored using only distant seismic and infrasound instruments and satellite data.

Cleveland volcano forms the western half of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. It is located about 75 km (45 mi.) west of the community of Nikolski, and 1500 km (940 mi.) southwest of Anchorage. The volcano's most recent significant eruption began in February, 2001 and it produced 3 explosive events that produced ash clouds as high as 12 km (39,000 ft) above sea level. The 2001 eruption also produced a rubbly lava flow and hot avalanche that reached the sea. The most recent minor ash emissions were observed in November 2012.

OTHER ALASKA VOLCANOES

Seismic activity is monitored in real time at 29 volcanoes in Alaska. Satellite images of all Alaskan volcanoes are analyzed daily for evidence of ash plumes and elevated surface temperatures. Some volcanoes may currently display anomalous behavior but are not considered to be at a dangerous level of unrest. Akutan, Aniakchak, Augustine, Dutton, Fisher, Fourpeaked, Gareloi, Great Sitkin, Griggs, Iliamna, Isanotski, Kanaga, Katmai, Mageik, Makushin, Martin, Novarupta, Okmok, Redoubt, Shishaldin, Snowy, Spurr, Tanaga, Trident, Ugashik-Peulik, Ukinrek Maars, Veniaminof, and Westdahl volcanoes are in color code GREEN and volcano alert level Normal. All are at or near normal levels of background seismicity. AVO did not detect ash plumes or significant elevated surface temperatures in the vicinity of any of these volcanoes.

Please see http://www.avo.alaska.edu/color_codes.php for complete definitions of Aviation color codes and Volcano alert levels.

VOLCANO INFORMATION ON THE INTERNET: http://www.avo.alaska.edu
RECORDING ON THE STATUS OF ALASKA'S VOLCANOES (907) 786-7478

CONTACT INFORMATION:
John Power, Scientist-in-Charge, USGS
jpower@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jeff.freymueller@gi.alaska.edu (907) 378-7556

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.

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AVO Alert Archive Search

CASCADES VOLCANO OBSERVATORY WEEKLY UPDATEFriday, May 24, 2013 9:07 AM PDT (Friday, May 24, 2013 16:07 UTC)

CASCADE RANGE VOLCANOES
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal levels of background seismicity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State; and Mount Hood, Mount Jefferson, Three Sisters, Newberry Volcano, and Crater Lake in Oregon.

Recent Observations: Seismicity and deformation in the Cascades generally remained at typical background levels this past week. The only notable events included a M2.5 quake just south of Mount St. Helens which was followed by a number of aftershocks over a several hour period and a 10-minute long mini-swarm of small quakes (max M0.9) beneath the lava dome, and two small quakes near the summit region of Mount Rainier. With the return of wet, wintery weather to the Cascades, it is possible we will see more noise on many of the local seismometers until the storms abate. People working and recreating around rivers in the region should be aware that river levels are higher this week as a result of the stormy weather.

The U.S. Geological Survey Cascades Volcano Observatory and the University of Washington continue to monitor the Washington and Oregon volcanoes closely and will issue additional updates and changes in alert level as warranted.

For other inquiries please call 360 993-8973.

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Mount St. Helens Seismic Information
CVO Alert Archive Search

HAWAIIAN VOLCANO OBSERVATORY DAILY UPDATEFriday, May 24, 2013 07:23 AM (Friday, May 24, 2013 17:23 UTC)

This report on the status of Kilauea volcanic activity, in addition to maps, photos, and Webcam images (available at http://hvo.wr.usgs.gov/activity/kilaueastatus.php), was prepared by the USGS Hawaiian Volcano Observatory (HVO). Hawai`i Volcanoes National Park status can be found at http://www.nps.gov/havo/ or 985-6000. All times are Hawai`i Standard Time.

KILAUEA VOLCANO (CAVW #1302-01-)
19°25'16" N 155°17'13" W, Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Activity Summary: At the summit, tilt and the lava lake level were stable over the past 24 hours. At the middle east rift zone, there was no lava activity within Pu`u `O`o crater, but the Kahauale`a II lava flow remained active north of Pu`u `O`o. To the southeast, the Peace Day flow had active breakouts on the pali and coastal plain, but most of the flow stayed within its lava tube until reaching the ocean on both the east and west sides of the Hawai`i Volcanoes National Park boundary. Gas emissions from the volcano remained elevated.

Recent Observations at Kilauea summit: The summit tiltmeter network recorded no significant net tilt since the end of the previous DI event on Thursday morning. The summit lava lake level was also largely stable, consistent with the lack of deformation. The most recent sulfur dioxide emission rate measurement was 825 t/d on May 23, 2013; this value is a minimum because the data are acquired close to the vent where the plume is most dense and challenging to fully characterize. The plume also contained a very small amount of ash-sized tephra (mostly fresh spatter bits and Pele's hair) that was deposited on nearby surfaces.

Seismic tremor levels were low, except for spikes caused by surface waves from large earthquakes near Tonga (South Pacific) and in Kamchatka (Russia). Only two earthquakes were strong enough to be located beneath Kilauea Volcano in the past 24 hours - one along the east rift zone, and one along the southwest rift zone. GPS receivers recorded a small amount of extension across the caldera during the first half of May, but since then only small variations have occurred (probably related to DI events).

Background: The summit lava lake is within a cylindrical vent with a diameter of ~160 m (520 ft) and nearly vertical sides inset within the east wall and floor of Halema`uma`u Crater. Its level has varied from about 25 m to more than 200 m (out of sight) below the floor of Halema`uma`u Crater. The vent has been mostly active since opening with a small explosive event on March 19, 2008. The surface level of the lava lake has remained mostly below the inner ledge (~31 m or 100 ft below the floor of Halema`uma`u Crater on October 29, 2012) and has risen above and flooded the ledge in October 2012 and January 2013 before receding to greater depths. The lake level responds to summit tilt changes with the lake receding during deflation and rising during inflation.

Recent Observations at the middle east rift zone vents: There were no lava flows in Pu`u `O`o, but incandescence was visible overnight at spatter cones on the crater floor. The tiltmeter on the north flank of Pu`u `O`o cone recorded only minor variations in tilt over the past 24 hours. The GPS line length from the north rim to the south base of Pu`u `O`o cone recorded no significant change over the past few weeks. The most recent (preliminary) sulfur dioxide emission rate measurement was 240 tonnes/day on May 23, 2013, from all east rift zone sources; these values have ranged between 150 and 450 t/d in 2013; measurements are made at a greater distance from the sources where the plume is more easily characterized.

The Kahauale`a II lava flow continued to spread slowly down the northern flank of Pu`u `O`o and across the 1980s-era `a`a flats at its base. The flow abuts, but has not yet reached, the forest about 1.6 km (1 mile) to the north of Pu`u `O`o. Southeast of Pu`u `O`o, the Peace Day flow has a small, persistent breakout on the pali in the abandoned Royal Gardens subdivision, and other breakouts are scattered across the coastal plain. One branch of the coastal plain breakouts is very close to the National Park boundary, and may even be partly within the National Park, about a kilometer (0.6 miles) out from the base of the pali. Most of the Peace Day flow, however, is contained within its tube system, which empties into the ocean in at least two places - a main entry point just east of the Hawai`i Volcanoes National Park boundary, and a smaller entry point just inside the National Park.

HAZARD ALERT: Lava entering the ocean builds lava deltas. The lava delta and adjacent areas are some of the most hazardous areas on the flow field. Frequent delta/bench collapses give little warning, can produce explosions capable of throwing both dense and molten rocks hundreds of meters (yards) in all directions (inland as well as out to sea), and can produce damaging local waves. The steam plume produced by lava entering the ocean contains fine lava fragments and an assortment of acid droplets that can be harmful to your health. The rapidly changing conditions near the ocean entry have been responsible for many injuries and a few deaths.

Background: The eruption in Kilauea's middle east rift zone started with a fissure eruption on January 3, 1983, and continued with few interruptions at Pu`u `O`o Cone, or temporarily from vents within a few kilometers to the east or west. A fissure eruption on the upper east flank of Pu`u `O`o Cone on Sept. 21, 2011, drained the lava lakes and fed a lava flow (Peace Day flow) that advanced southeast through the abandoned Royal Gardens subdivision to the ocean within Hawai`i Volcanoes National Park in early December 2011. Since late December 2011, the flows have remained intermittently active on the pali and the coastal plain and finally re-entered the ocean starting on November 24, 2012. The Kahauale`a flow, which started from the spatter cone/lava lake at the northeast edge of the Pu`u `O`o crater floor in mid-January, 2013, was dead by late April, but a new flow (Kahauale`a II) became active in the same general area in early May . In general, activity waxes with inflation and wanes with deflation.

Hazard Summary: East rift vents and flow field - near-vent areas could erupt or collapse without warning with spatter and/or ash being wafted within the gas plume; potentially-lethal concentrations of sulfur dioxide gas may be present within 1 km downwind of vent areas. All recently active lava flows are within Hawai`i Volcanoes National Park, adjacent State land managed by the Department of Land and Natural Resources, and private property; the lava flows do not pose a hazard to any structures not already within the County-declared mandatory evacuation zone. Lava deltas, which can collapse into the ocean without warning, are extremely hazardous and should be avoided (see HAZARD ALERT above). Kilauea Crater - ash and Pele's hair can be carried several kilometers downwind; potentially-lethal concentrations of sulfur dioxide can be present within 1 km downwind.

Viewing Summary: East rift zone flow field - Most of the flow field is within the closed-access Kahauale'a Natural Area Reserve (NAR) and the abandoned Royal Gardens subdivision and can only be viewed from the air. A small part of the western flow field near the coast in within Hawai`i Volcanoes National Park (see below for access info). Under favorable weather conditions, active flows-when present-can be seen from the County Viewing Area at Kalapana (Lava hotline 961-8093). Pu`u `O`o Cone and Kilauea Crater - these areas are within Hawai`i Volcanoes National Park; Park access and viewing information can be found at http://www.nps.gov/havo/planyourvisit/lava2.htm.

Additional Information:

For a definition of volcano alert levels and aviation color codes: http://volcanoes.usgs.gov/activity/alertsystem/index.php

Maps, photos, Webcam views, and other information about Kilauea Volcano are available at http://volcanoes.usgs.gov/hvo/activity/kilaueastatus.php. A daily update summary is available by phone at (808) 967-8862.

A map with details of earthquakes located within the past two weeks can be found at http://hvo.wr.usgs.gov/seismic/volcweb/earthquakes/

HVO Contact Information:

askHVO@usgs.gov

Definitions of Terms Used:

DI tilt event: DI is an abbreviation for 'deflation-inflation' and describes a geophysical event of uncertain volcanic significance. DI events are recorded by tiltmeters at Kilauea summit as an abrupt deflation of up to a few microradians in magnitude lasting several hours (weak DI events) to 2-3 days (strong DI events) followed by an abrupt inflation of approximately equal magnitude. The tilt events are usually accompanied by an increase in summit tremor during the deflation phase. A careful analysis of these events suggests that they may be related to changes in magma supply to a storage reservoir at less than 1 km depth, just east of Halema`uma`u crater. Usually, though not always, these changes propagate through the magma conduit from the summit to the east rift eruption site, as many of the DI events at Kilauea summit are also recorded at a tiltmeter at Pu`u `O`o delayed by several hours. DI events often correlate with lava pulses and/or pauses in the eruption at the Pu`u `O`o/Peace Day vents.

fill-and-drain, rise/fall cycles/events or high lava stands: one of the cyclical behaviors exhibited by the summit lava lake in starting in 2009. An event starts with a rise in lava level, a decrease in high-frequency summit tremor amplitude, and a small decrease in tilt. After a period of minutes to hours, the lava will abruptly drain back to its previous level, seismic tremor amplitude will increase for a short time (a seismic tremor burst), and summit tilt will return to its previous level. Although not measured continuously, spot checks of gas emissions demonstrate that far less gas is released during the high lava stand than during its draining phase suggesting that, during the high lava stand, lava is puffed up with gas trapped by crusts on the lava surface; the gas plume will also get thin and wispy during these cycles returning to more robustness afterward. In 2013, the character of these events has changed and are marked more by a lack of spattering sinks and less by a rise in lava level or tilt change during the low seismic tremor levels.

perched lava lake: a lava lake within a rim that is progressively built up by overflows of lava that have cooled and solidified. The most recent example of a perched lava lake is currently active within Pu`u `O`o maintaining a rim standing several meters (yards) above the crater floor. In many ways, a perched lava lake resembles an above-ground swimming pool. Overflows from the pond add layers to the surrounding crater floor building it higher; the overflows also build up the perched lake rim, continually keeping the lake rim raised above the floor.

mauka, makai: Hawaiian terms for directions relative to the coast - makai or ma kai (toward the coast) and mauka or ma uka (toward the highlands or away from the coast).

pali: Hawaiian term for cliff or precipice.

composite seismic events: is a seismic signal with multiple distinct phases that has been recorded frequently at HVO from the Halema`uma`u Overlook vent area since its explosive opening in March, 2008. For the composite events recorded at Halema`uma`u, we typically see an initial high frequency vibration lasting for a few seconds that have been correlated with rockfalls. This is followed by about 30 seconds of a long-period (LP) oscillation with an approximately 2- to 3-second period. The final phase of the signal is several minutes of a very-long-period (VLP) oscillation with an approximately 25- to 30-second period. The LP signals are interpreted to be from the uppermost portion of the conduit and VLP signals are interpreted to be fluid passing through a deep constriction in the conduit through which lava rises to the pond surface we see in the webcam.

Halema`uma`u Overlook vent: has been difficult to describe concisely. The vent is actually a pit, or crater, in the floor of the larger Halema`uma`u Crater which is, in turn, in the floor of the larger Kilauea caldera or crater - a crater within a crater within a crater. It is easiest to describe as a pit inset within the floor of a crater within a caldera. The pit is about 160 m (525 ft) in diameter at the Halema`uma`u Crater floor, is about 50 m in diameter at a depth of 200 m (660 ft) below the Halema`uma`u Crater floor. From November, 2009, to now, a lava pond surface has been visible in this pit.

glow: light from an unseen source; indirect light.

incandescence: the production of visible light from a hot surface. The term also refers to the light emitted from a hot surface. The color of the light is related to surface temperature. Some surfaces can display dull red incandescence at temperatures as low as 430 degrees Centigrade (806 degrees Fahrenheit). By contrast, molten lava displays bright orange to orange-yellow light from surfaces that are hotter than 900 degrees C (1,650 degrees F).

CD: Hawai`i County Civil Defense

tonne: metric unit equal to 1,000 kilograms, 2,204.6 lbs, or 1.1 English tons.

tephra: all material deposited by fallout from an eruption-related plume, regardless of size.

ash: tephra less than 2 mm (5/64 inches) in size.

microradian: a measure of angle equivalent to 0.000057 degrees.

More definitions with photos can be found at http://volcanoes.usgs.gov/images/pglossary/index.php.

The Hawaiian Volcano Observatory is one of five volcano observatories within the U.S. Geological Survey and is responsible for monitoring volcanoes and earthquakes in Hawai`i.

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HVO Alert Archive Search

CALIFORNIA VOLCANO OBSERVATORY MONTHLY UPDATESaturday, May 18, 2013 4:44 PM PDT (Saturday, May 18, 2013 23:44 UTC)

Monitored CALIFORNIA VOLCANOES
Current Volcano Alert Level: all NORMAL
Current Aviation Color Code: all GREEN

Activity Update: All volcanoes monitored by CalVO's telemetered, real-time sensor networks exhibit normal levels of background seismicity and deformation. Real-time monitoring networks are in place at Mount Shasta, Medicine Lake Volcano, Clear Lake Volcanic Field, Lassen Volcanic Center, Long Valley Caldera and Mono-Inyo Chain.


Observations for April 1, 2013 (0000h PT) through April 30, 2013 (2359h PT):
Mt Shasta: No earthquakes were detected.
Medicine Lake: One M=1.1 earthquake was detected.
Lassen Volcanic Center: Five earthquakes were detected, all of which were below magnitude 2.0.
Clear Lake Volcanic Field: Eight earthquakes were detected (all less than magnitude 2.0). [Note: Typical high level of seismicity was observed under the Geysers steam field located at the western margin of CLVF. The largest event was M=3.4].
Long Valley Caldera and Mono-Inyo Chain: Thirteen earthquakes were located in the southern part of Long Valley Caldera (all were below magnitude 2.0 ); One M=2.6 earthquake was located on the Mono-Inyo chain near June Lakes. Five earthquakes were detected under Mammoth Mountain (all magnitudes under 2.0) [Note: The typical high level of seismicity was observed south of the caldera in the Sierra Nevada range. The largest event was M=2.4]

The U.S. Geological Survey will continue to monitor these volcanoes closely and will issue additional updates and changes in alert level as warranted. For a definition of alert levels see http://volcanoes.usgs.gov/activity/alertsystem/icons.php.

As part of the U.S. Geological Survey's Volcano Hazards Program, the California Volcano Observatory aims to advance scientific understanding of volcanic processes and lessen the harmful impacts of volcanic activity in the volcanically active areas of California and Nevada. For additional USGS CalVO volcano information, background, images, and other graphics visit http://volcano.wr.usgs.gov/vsc/observatories/calvo.html. For general information on the USGS Volcano Hazard Program http://volcanoes.usgs.gov. Statewide seismic information for California and Nevada can be found at http://earthquake.usgs.gov/earthquakes/recenteqscanv/.

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CalVO Alert Archive Search

NORTHERN MARIANA ISLANDS WEEKLY UPDATEFriday, May 24, 2013 08:00 AM (Thursday, May 23, 2013 22:00 UTC)

Report prepared by the U.S. Geological Survey.

PAGAN VOLCANO (CAVW #0804-17=)
18°7'48" N 145°48' E, Summit Elevation 1870 ft (570 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

A constant steam and gas plume from Pagan was visible in satellite images over the past week. This is typical of recent months of observation of Pagan. A pilot report from a commercial aircraft flying over Pagan on Tuesday reported a vigorous plume although no ash was identifiable in satellite images and there were no reports of eruptive activity by residents on the island. The gas/vapor plume may just have been more vigorous on this day.

Because of this ongoing emission of volcanic gas from Pagan, it remains possible that residents of the CNMI may notice sulfurous odors under certain wind conditions. Additional information about volcanic gas and vog can be found online at this address: http://hvo.wr.usgs.gov/hazards/FAQ_SO2-Vog-Ash/main.html

Pagan Volcano is not monitored with ground-based geophysical instrumentation and the only sources of information are satellite observations and occasional reports from observers who pass by or visit the island. We will continue to evaluate satellite imagery, on-island, and mariner reports when they become available, but because the volcano is not monitored with ground-based instruments, we cannot provide advanced warning of activity.

Access to the island may be restricted by the CNMI government. Contact the EMO for the latest information.

No eruptive activity or significant unrest was detected at other volcanoes in Northern Mariana Islands this week.

CONTACT INFORMATION:
USGS Northern Marianas Duty Scientist (808) 967-8815
http://volcano.wr.usgs.gov/cnmistatus.php

CNMI Emergency Management Office (670) 322-8001
http://www.cnmiemo.gov.mp/

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NMI Alert Archive Search

YELLOWSTONE VOLCANO OBSERVATORY MONTHLY UPDATEWednesday, May 8, 2013 10:24 AM MDT (Wednesday, May 8, 2013 16:24 UTC)

YELLOWSTONE VOLCANO (CAVW #1205-01-)
44°25'48" N 110°40'12" W, Summit Elevation 9203 ft (2805 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

During the month of April 2013, the University of Utah located 126 earthquakes in the Yellowstone National Park region. The largest earthquake occurred about 8 miles north north-west of Lake, WY on April 9, 2013 at 03:33 AM MDT and had a magnitude of 3.1.

April seismicity in Yellowstone was marked by three distinct clusters of episodic earthquakes:

1) 10 events located about 8 miles north-northwest of Lake, WY on April 9, 2013 including the largest event of the month. Two other earthquakes occurred near here on April 20th, 2013.
2) 30 events located about 10 miles East of Grayling, MT, with the largest, a magnitude 1.6, occurring amid a swarm of 19 earthquakes from April 11 - 16.
3) A swarm of 19 earthquakes up to magnitude 2.9, occurred over four hours on April 16, 2013, located about 8 miles southwest of West Thumb, WY. This swarm is part of a larger cluster of 46 events in the Pitchstone Plateau area. The majority of this cluster of seismicity occurred in two time periods, April 7 - 9 (14 events) and April 15 -16 (31 events).

Yellowstone earthquake activity is occurring at normal background levels.

Slow subsidence of the caldera, which began in early 2010, continues. Current deformation patterns at Yellowstone are well within historical norms.

Please see: http://www.uusatrg.utah.edu/ts_ysrp.html for a map of GPS stations in the Yellowstone vicinity. For a graph of daily GPS positions at White Lake, within the Yellowstone caldera, please see: http://pbo.unavco.org/station/overview/WLWY

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The Yellowstone Volcano Observatory (YVO) provides long-term monitoring of volcanic and earthquake activity in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.

YVO Member agencies: USGS, Yellowstone National Park, University of Utah, University of Wyoming, UNAVCO, Inc., Wyoming State Geological Survey, Montana Bureau of Mines and Geology, Idaho Geological Survey

CONTACT INFORMATION:
Jacob Lowenstern, USGS
Scientist-in-Charge, Yellowstone Volcano Observatory
jlwnstrn@usgs.gov

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