Saturday morning (2015.08.29), residents in Fort Bragg were awakened by a M 3.6 earthquake along a fault that lies between the San Andreas fault (SAF) to the west and the Maacama fault (MF) to the east. Here is the USGS…
Mendocino fault earthquake
We had a small magnitude earthquake “today” along the Mendocino fault system approximately 150 km west of Cape Mendocino. Here is the USGS web page for the Mw 4.8 earthquake. Based upon the tectonic setting, the hypocentral depth, and the…
New Britain trench seismicity: 2000 through March 2015
I have here placed the moment tensors for the large magnitude earthquakes along the New Britain trench for the time period from 2000 through March 2015. Note that the Mw 8.0 has a strike-slip moment tensor. There is a transform…
Molucca Earthquake
This region is a seismically active region. Today we had a M 6.2 earthquake. Here is the USGS web page for this earthquake. Last November, there were a series of large magnitude compression aearthquakes. Here are some posts about these…
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…
Gorda plate earthquake 2015.02.24
Where else would we get a focal mechanism or moment tensor for an earthquake of such a small magnitude! We are so lucky. This is the USGS web page for the earthquake. We get Gorda plate earthquakes frequently and most…