We just had an earthquake along the nodal plane of the Gorda plate earthquake earlier today. Here is the USGS web page for the Gorda M = 4.3 earthquake and here is the USGS web page for the Gorda plate…
Gorda plate earthquake: 2010 zone strikes again
Early this morning we had a small rumbler offshore of northern California, generally in the same location as the 2010.01.10 earthquake. I remember the 2010 earthquake very well as the ground shaking lasted over 20 seconds in Manila. Here is…
Mid Atlantic Ridge Plate Boundary
In the past week, there have been a few earthquakes along the Mid Atlantic Ridge (MAR) and some associated fracture zones. The Mid Atlantic Ridge is a divergent plate boundary. As the plates move apart, the asthenosphere is decompressed and…
Sandwich Islands Earthquake… mmmm
We just had a M 5.8 earthquake in the volcanic arc region of the Scotia subduction zone. The moment tensor (currently) shows an extensional mechanism. I will post more on this as I am about to hit the road. Here…
Santa Cruz (western Pacific) Earthquake Swarm!
The past couple of days have brought us a series of large magnitude strike-slip earthquakes along a plate boundary between the Solomon Trench and the New Hebrides Trench. I posted about the first earthquake here and here. This swarm of…
Earthquake in the Solomon Islands!
Following yesterday’s seismic swarm along the plate boundary that connects the Solomon Trench with the New Hebrides Trench, we have a M = 6.0 compressional earthquake in the Solomons. Today’s earthquake is in the region of the possibly subduction zone…
Santa Cruz Islands Earthquake: Update #1
The USGS has presented their moment tensor solution for this M = 6.8 earthquake and it indeed appears to be a strike-slip type of an earthquake, supporting our interpretation that this is a transform plate boundary. Here was my first…
Nepal (Gorkha) Earthquake: USGS Slip Models
The USGS has processed an inversion of the seismic data for a slip model for the Mw 7.3 earthquake. I have rubbersheeted their fault plane solution, as well as the solution for the Mw 7.8 earthquake for comparison. Please find…
Large Aftershock in Nepal: 3rd Update
After some debate online, I decided to put this quick map together. Clicking on the epicenters in google earth or on the USGS earthquakes page, one can easily determine that there were aftershocks from the 2015.04.25 Mw 7.8 earthquake in…
Large Aftershock in Nepal: 2nd Update
Well, there have been a few more aftershocks over night… Here is my first post about these aftershocks (I provide more links to the USGS web sites). Plus, the USGS has inverted the seismic data to estimate a fault plane…