We had a small flurry of earthquake activity in Chile today, along the subduction zone there. Today’s activity is in the the region of the 2010 earthquake sequence. The largest magnitude earthquake in today’s sequence is a M = 6.2.…
Earthquakes in Chile: Between the 2010 and 2014 Slip Patches
There have been a few earthquakes in the region between the 2010 and 2014 Chile subduction zone earthquakes. This is a seismic gap that has not had a Great earthquake since 1977, a ~M = 8.5 earthquake that spanned the…
Moderately Deep Focus Earthquake in Colombia
There was a moderately deep focus extensional earthquake beneath Colombia today. Here is the USGS web page for this earthquake. Here is a map that shows the epicenter as a green dot. Historic earthquake epicenters are plotted in grey. The…
Earthquake near Siberut, Indonesia: Sumatra Megathrust
Yesterday (I was busy getting a Mt. St. Helens field trip together, here is the link for that) we had an earthquake with a magnitude M = 6.1. While this is not a large earthquake, it is notable because this…
another earthquake in the east Java / Timor region of Indonesia
We had another earthquake in this region today. This is an interesting area of the world since this is a place where there is a transition between subduction to the west and collision to the east. The Island of Timor…
Indonesia Strikes Again
A deep earthquake has occurred probably within the downgoing Indo-Australia plate. The moment tensor shows oblique extension (part strike-slip, part normal). The depth aligns with the depth of the plate given the Hayes et al. (2012) slab models (which ends…
another northeast Japan earthquake in the Tohoku-Oki earthquake region
We have had another small aftershock. Here is the USGS web page for this earthquake. This time it is in a different region than the swarm of the past couple of weeks. There are several report updates, listed here: 2015.02.16…
Tohoku-Oki aftershocks are in a region of low slip during main events in 2011
Here is what I was getting at in my last post. I have taken the Ammon et al. (2011) slip model and placed it into a real world reference frame (rubbersheeted it in ArcGIS). Then I exported it as a…
Tohoku-Oki Aftershocks Continue
The aftershocks continue offshore northeast Japan. The recent swarm appear to align along a northwesterly strike (trend). Here is the USGS web page for the earthquake from today. This is the USGS web page for the largest magnitude earthquakes in…
Japan earthquake may be aftershock to 2011 Tohoku-Oki earthquake
The USGS depth has been updated to 23.3 km. Now we may interpret this to be an interface earthquake. Here is my first post about this earthquake and here is a post about some aftershocks. There are several report updates,…