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USGS Volcano Notice for Aviation - DOI-USGS-NMI-2023-10-05T16:22:49-07:00
| (1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA) | |
| (2) Issued: | (20231005/2350Z) |
| (3) Volcano: | Ruby (VNUM #284202) |
| (4) Current Color Code: | UNASSIGNED |
| (5) Previous Color Code: | YELLOW |
| (6) Source: | U.S. Geological Survey |
| (7) Notice Number: | 2023/N196 |
| (8) Volcano Location: | N 15 deg 37 min E 145 deg 34 min |
| (9) Area: | Northern Mariana Islands |
| (10) Summit Elevation: | -755 ft (-230 m) |
| (11) Volcanic Activity Summary: |
No sign of new volcanic activity has been detected at Ruby Seamount since September 14 and 15. Since there is no indication of ongoing activity, the Aviation Color Code and Volcano Alert Level are being lowered back to UNASSIGNED, reflecting the lack of nearby monitoring instruments that could detect lower-level events. It is possible that further eruptive activity could occur at Ruby. 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 array of underwater pressure sensors at Wake Island. Ruby is a submarine volcano that rises to within 230 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. |
| (12) Volcanic cloud height: | none observed |
| (13) Other volcanic cloud information: | none observed |
| (14) Remarks: | |
| (15) Contacts: | CNMI Homeland Security and Emergency Management |
| (16) Next Notice: | |