Social media was abuzz today about the M 6.0 earthquake in Napa. Here is the USGS webpage for the M 6.1 earthquake. This earthquake, and the aftershocks, have epicenters that lie between the Rogers Creek and Green Valley fault systems.…
Earthquake swarm in western Iran
Here we find an earthquake swarm in western Iran. The convergence between the Afica and Indo-Australia plates with the Eurasia plates is evidenced by the subduction zone along Sumatra and Java, the uplift of the Himalayas, the fold and thrust…
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.…
M 7.9 Aleutians Earthquake!
This one is large and fairly deep. Here is the USGS web page for this earthquake. There are several aftershocks, the largest so far is M 6. Today’s earthquakes are located along the Aleutian subduction zone, nearby the Bolan Ridge…
Panama Aftershocks Reveal Likely Fault Solution
All rightee… We have a number of aftershocks that are lighting up the potential fault that ruptured a couple days ago. Here is my page for this earthquake. Here is the USGS page. The aftershocks are aligned with the north-south…
SSA 2014 Photos
I have placed some photos into a basic photo gallery. These are from the 2014 Seismological Society of America Meeting in Anchorage, Alaska.
1964 Earthquake Animation
Here is a simulation of the 1964 earthquake. I found this posted online on livescience (they do not typically provide a link to the original content, but repost without attribution) but here is the source. Carl is an assistant professor of…
Earthquake offshore Panama
Good sized earthquake offshore Panama! Here is the USGS page. This is probably an earthquake on an oblique high angle reverse fault, based on this early moment tensor. The hypocentral depth is pretty shallow too. This looks related to the…
Update Commentary on the OSO Slide: Scott Burns
Scott Burns, emeritus at Portland State and a student of Peter Birkeland, wrote an excellent article about the OSO Slide. I made a few animations and armchair interpretations about this slide shortly after it happened (here). Scott discusses the geologic…
1964 Great Alaska Earthquake: Before and After Photos
I just got back from a great Seismological Society Meeting in Anchorage, Alaska. The meeting was held there in part to celebrate the 50th anniversary of the 1964 Great Alaska Earthquake. I will post more online in the coming week.…