Here is a large aftershock M7 near the island closest to the mainshock M8.
USGS site page
Here is a summary poster of the tectonics in the region:
USGS site page
USGS poster (68MB pdf)
Monthly Archives: February 2013
Interesting aftershock to the M8 Santa Cruz Isles earthquake
Here is an aftershock that appears to be past the end of the subduction zone. The people who work in this region have not extended the subduction zone this far. I look forward to seeing the focal mechanism for this earthquake to see if it has a transform mechanism.
USGS site
M8 Santa Cruz Isles earthquake tsunami hazard diminishing
At least for the west coast of the US and Hawaii, the tsunami hazard potential is diminishing. The tsuami watch for Hawaii has been removed and locally measured wave heights (Solomon Isles) are under 1 m. Locally destructive and dangerous.
here is the WCATWC latest notice.
here are the latest observations:
TIME OBSERVED MAX
SITE OF MEASUREMENT TSUNAMI HEIGHT
—————————- ————— ————–
LATA WHARF SOLOMON ISL 0131 UTC 02-06 03.4FT
DART52406PT NE GUADALCA 0211 UTC 02-06 00.3FT
DART55012ST SE CORAL SE 0232 UTC 02-06 00.4FT
HONIARA SOLOMON ISLAND 0307 UTC 02-06 00.2FT
PORT VILA VANUATU 0303 UTC 02-06 00.6FT
HEIGHT – OBSERVED MAX TSUNAMI HEIGHT IS THE WATER LEVEL ABOVE THE
TIDE LEVEL AT THE TIME OF MEASUREMENT.
M8 Santa Cruz Isles: tsunami measured
In California, an informational statement has been issued:
PUBLIC TSUNAMI INFORMATION STATEMENT NUMBER 2
NWS WEST COAST/ALASKA TSUNAMI WARNING CENTER PALMER AK
625 PM PST TUE FEB 5 2013
…THIS IS A TSUNAMI INFORMATION STATEMENT FOR ALASKA/ BRITISH
COLUMBIA/ WASHINGTON/ OREGON AND CALIFORNIA…
* THIS EARTHQUAKE HAS THE POTENTIAL TO GENERATE A DESCTRUCTIVE
TSUNAMI IN THE SOURCE REGION.
In the Solomon Islands, the first measurement has been recorded:
OBSERVATIONS OF TSUNAMI ACTIVITY - UPDATED ------------------------------------------ TIME OBSERVED MAX SITE OF MEASUREMENT TSUNAMI HEIGHT ---------------------------- --------------- -------------- LUGANVILLE VU 15.5S 167.2E 0243Z 0.11M / 0.4FT 18MIN DART 52406 5.3S 165.1E 0206Z 0.04M / 0.1FT 10MIN DART 55012 15.8S 158.5E 0237Z 0.17M / 0.6FT 06MIN LATA WHARF SB 10.7S 165.8E 0129Z 0.91M / 3.0FT 18MIN HEIGHT - OBSERVED MAX TSUNAMI HEIGHT IS THE WATER LEVEL ABOVE THE TIDE LEVEL AT THE TIME OF MEASUREMENT.
The Tide Gage is on the Island immediately east of the epicenter.
M8 in the Santa Cruz Islands region (Vanuatu subduction zone, New Hebrides trench)
M8 Earthquake following a couple weeks of increased seismic activity in the region. located at the northern end of this subduction zone. Here is a map of the subduction zone:
Here is the USGS web page for the earthquake.
Here is a map of the slab for the subduction zone there (3MB pdf).
Here is a google earth map of the epicenter: