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.…
Vancouver Isle M 6.6 Earthquake
Interesting little swarm here, on the coast of northwestern Vancouver Island. The convergence of these plates results in the Cascadia subduction zone (CSZ), that extends from Cape Mendocino in the South to at least Haida Gwaii in the North (there…
Another triggered earthquake in the Solomon Islands
This is a very interesting part of the world, where subduction and transform faults interact with each other. The New Britain trench is linked to the New Hebrides trench with a plate boundary fault. Based on plate motions, this could…
Solomon M 7.6 aftershocks
The aftershocks continue to light up the earthquake fault that is participating in the part of the three pronged swarm in this region, I mentioned earlier. Two deep swarm regions of compressional earthquakes in the north, with this strike slip…
Solomon aftershocks are lining up!
This is an update to some material I posted earlier. The possible orietation of the M 7.6 earthquake may be revealing itself by the spatial pattern of aftershocks. This map shows some aftershocks. I placed the moment tensor here also.…
These earthquakes, in the Solomons
Here is the latest in the story this April 2014. Another large magnitude earthquake has occurred in locations associated with the New Britain trench in the Solomon Islands. Here is the USGS website for this earthquake. There is some background…
Where is waldo?
This earthquake swarm is pretty interesting. We clearly have lots to learn about the tectonics of this region. One of the biggest mysteries yet to be solved is what fault the mainshock occurred on. The M 7.1, reported about early…
Panguna, Papua New Guinea: subduction zone earthquake
This looks to have shaken people up, just by looking at the intensity map below. These are generated automatically and take some assumptions that simplify the results (so the real shaking is probably not what the shake map intensity maps…