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Category: Transform (page 9)

Small Earthquake in San Francisco Region

Posted on: May 3, 2015 Last updated on: May 3, 2015 Written by: Jay Patton Comments: 2
There was a M 3.6 earthquake near Concord, CA. This earthquake was felt widely across the S.F. Bay area. The two earthquakes plotted in the map below are both just southeast of the 2014 August Napa earthquake. The Napa earthquake,…
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Earthquakes in Los Angeles

Posted on: May 3, 2015 Last updated on: May 3, 2015 Written by: Jay Patton Comments: 3
We have had a number of small earthquakes in the Los Angeles Basin in the past month. These three earthquakes appear aligned with the Newport Inglewood fault system, the fault that ruptured in 1933 for what is generally called the…
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Earthquake in Crete

Posted on: April 16, 2015 Last updated on: April 16, 2015 Written by: Jay Patton Comments: 5
We just had a M = 6.0 earthquake in Crete. Here is the USGS web page for this earthquake. This is an interesting region tectonically. The convergence of the Africa-India-Australia plates northwards towards the Eurasian plate runs from west of…
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Earthquake in the Baldwin Hills (Los Angeles)

Posted on: April 13, 2015 Last updated on: April 13, 2015 Written by: Jay Patton Comments: 4
Well, there was quite a buzz on social media following this small magnitude earthquake today. Here is the USGS web page for this Mw 3.3 earthquake. The earthquake appears to be related to the Newport-Inglewood fault system and the epicenter…
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Blanco fracture zone strikes again

Posted on: April 12, 2015 Last updated on: April 12, 2015 Written by: Jay Patton Comments: 5
The Blanco fracture zone (BFZ) is a transform plate boundary that connects the Juan de Fuca ridge with the Gorda rise spreading centers. This active fault zone consists of numerous right-lateral (dextral) faults. There is some debate as to how…
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Mendocino fault earthquake

Posted on: April 10, 2015 Last updated on: April 10, 2015 Written by: Jay Patton Comments: 5
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…
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New Britain and Bougainville: tectonic domains?

Posted on: March 30, 2015 Last updated on: March 30, 2015 Written by: Jay Patton Comments: 12
I was taking a looksie at the different moment tensors for the years of 2000, 2010, 2014, and March 2015. I noticed that the transform plate boundary on the eastern side of the South Bismarck plate may separate segments of…
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New Britain trench seismicity: 2000 through March 2015

Posted on: March 29, 2015 Last updated on: March 29, 2015 Written by: Jay Patton Comments: 15
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…
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Northern Mid Atlantic Ridge: Charlie Gibbs fracture zone

Posted on: February 13, 2015 Last updated on: February 13, 2015 Written by: Jay Patton Comments: 4
We had a large Mw 7.1 earthquake today along the Charlie Gibbs fracture zone, which is the longest transform plate boundary fault system in the North Atlantic, which offsets the Reykjanes Ridge from the Mid Atlantic Ridge. Here is a…
Continue reading “Northern Mid Atlantic Ridge: Charlie Gibbs fracture zone”…

Panama fracture zone strikes again

Posted on: February 4, 2015 Last updated on: February 4, 2015 Written by: Jay Patton Comments: 1
We have another earthquake along the Panama fracture zone (PFZ) plate boundary. There are numerous sub-parallel transform (strike-slip) faults in this region. The most recent earthquake is a M = 5.7 and is plotted as the most southerly orange dot…
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