We just had a good sized shallow compressional earthquake in the northern part of the 2011 Tohoku-Oki earthquake slip region. The USGS web page lists the magnitude at Mw 6.7. Here is a great summary of the tectonics of this…
Cascadia’s 315th Birthday
On this morning, 315 years ago, the Cascadia subduction zone fault ruptured as a margin wide earthquake. I here commemorate this birthday with some figures that are in two USGS open source professional papers. The Atwater et al. (2005) paper…
Sumatra-Andaman subduction zone 2014/12/26: Slip, Deformation, and Energy
Here is an update to my post earlier on the 2004 Sumatra-Andaman subduction zone earthquake of 2004/12/26 (about a decade ago). This series of plots show the large variation in non unique slip models for this earthquake. The authors divide…
Boxing Day Earthquake: Sumatra-Andaman subduction zone 2014/12/26
The Decadal Anniversary is coming up and I will be posting some material regarding the earthquake and tsunami that changed the lives of millions. This Mw 9.15 earthquake, slightly smaller in magnitude than the M 9.2 Good Friday Earthquake of…
Another Aftershock in the Molucca Sea!
This earthquake happened really close to the M 7.1 from earlier (2014/11/15). Here is my page that has more information about the regional tectonic interpretations. Here is the USGS page for this M 6.8 earthquake. Here is the updated map…
Another Earthquake in the Molucca Sea
We just had another large earthquake in this region. Here is the USGS page for this M 6.5 earthquake. This earthquake hypocenter is much deeper than what we might expect for a subduction zone interface earthquake in this region. The…
Earthquake along the Halmahera Arc
There was a Mw 7.1 thrust earthquake along the Halmahera Arc (a subduction zone) in the Molucca Sea, Indonesia. Here is the USGS web page for this earthquake. There was a small amplitude tsunami observed in the region of the…
Earthquake offshore of El Salvador!
We just had a large magnitude earthquake offshore of El Salvador. Here is the USGS web page for the earthquake. Based on the magnitude and depth, it is not expected to have triggered a tsunami that would reach the coast…
Earthquake near Guam!
Last night (Pacific Time) there was a M 6.7 earthquake in the western Pacific near Guam. Here is the USGS page for the earthquake. The depth is about 137 km, so it is unlikely to generate a tsunami. Also, the…
M 7.9 Rat Island / Aleutian Islands: aftershocks reveal more
There have been a nice suite of aftershocks to help us interpret these data. There were several aftershocks less than or equal to M = 6. These occurred within hours of the mainshock. They also occurred northwest of the mainshock.…