We just had a good sized shaker, probably on the Mendocino fault system. Today’s earthquake occurred on 1/28/2015 at 1:08 local time. The mainshock, an earthquake of magnitude Mw = 5.7, has an epicenter approximately 20 km due west of…
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…
Earthquake along the New Britain trench (Solomon Isles and Papua New Guinea)
We just had an earthquake swarm along the subduction zone trench offshore of the Solomon Islands. Here is the USGS earthquake page for this Mw 6.8 subduction zone earthquake. Here is a map of the region with the recent swarm.…
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…
Earthquake in Central Honshu!
This morning (my time) there was a large earthquake in central Honshu. Here is the USGS page for this earthquake. The earthquake hypocentral depth is shallow, giving rise to the likelihood of damage to infrastructure and people. Here is a…
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…
Lassen Earthquake Swarm
There is currently an ongoing earthquake swarm in the region immediately south of Mt. Lassen. The largest magnitude is a M 3.9 (USGS). The California Volcano Observatory (CalVO) is monitoring these earthquakes. The earthquakes do not appear to be related…