NORTHERN MARIANA ISLANDS VOLCANO OBSERVATORY DAILY UPDATE
U.S. Geological Survey
Sunday, September 24, 2023, 7:23 AM ChST (Saturday, September 23, 2023, 21:23 UTC)
Report prepared by the U.S. Geological Survey.
RUBY VOLCANO (VNUM #284202)
15°37'12" N 145°34'12" E, Summit Elevation -571 ft (-174 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW
No activity has been detected at Ruby in regional seismic and infrasound data or in satellite imagery over the past day. The plume of discolored water from the September 14-16 eruption has dispersed but remains faintly visible in the ocean offshore of Saipan to the north.
It is possible that further eruptive activity could occur at Ruby. There are no local monitoring stations at Ruby, which limits our ability to detect and characterize volcanic unrest there. The volcano is monitored by a regional geophysical monitoring network, including a station at Saipan (50 km away) as well as others in Guam, Japan, and an underwater pressure sensor at Wake Island.
Ruby is a submarine volcano that rises to within 174 m of the sea surface near the southern end of the Mariana arc northwest of the island of Saipan. The volcano was first detected in eruption in 1966 by sonar signals. In 1995, submarine explosions were heard, accompanied by a fish kill, sulfurous odors, bubbling water, and the detection of volcanic tremor.
For definitions of Aviation Color Codes and Volcano Alert Levels, see: http://volcanoes.usgs.gov/activity/alertsystem/index.php
SUBSCRIBE TO VOLCANO ALERT MESSAGES by email: http://volcanoes.usgs.gov/vns/
CNMI Homeland Security and Emergency Management
USGS Northern Mariana Duty Scientist (907) 786-7497
Satellite information, Washington VAAC