There was a M 6.2 earthquake in Italy tonight. Here is the USGS website for today’s earthquake. There is lots of information about the tectonics of this region. I can hardly do justice to all the people who have worked…
Earthquake Report: Gorda!
There was just a pair of earthquakes near the Gorda rise. There was first an earthquake of magnitude M = 5.0, followed by a M = 4.9. The 5.0 appears to be within the GP, but the 4.9 seems to…
Earthquake Report: Deep in Peru!
Today we had a series of deep focus earthquakes in Peru. This suite of earthquakes occurred in a region that ruptured in the 1960s and recently in 1990. Further to the south, in 1994, there was a deep earthquake that…
Earthquake near Chico!
I hope not too many bottles of Sierra Nevada broke from this small earthquake. Based on the “Did You Feel It?” reports, I suspect that this did not happen. Here is the USGS website for this M = 3.5 earthquake.…
Earthquake mini-swarm near La Pine, OR!
Over the past day or so, there has been a swarm of seismicity in the La Pine area. La Pine is on the east side of the Cascade mountain range, a magmatic arc related to the Cascadia subduction zone. As…
Plate Tectonics: 200 Ma
Gibbons and others (2015) have put together a suite of geologic data (e.g. ages of geologic units, fossils), plate motion data (geometry of plates and ocean ridge spreading rates), and plate tectonic data (initiation and cessation of subduction or collision,…
Gulf of California Earthquakes! (first update)
Here is an update to the early morning post… I have prepared an updated map that shows the fracture zones, spreading ridges, transform faults, and basins in the region of seismicity from the past 24 hours. Here is the map.…
Earthquake near the Santa Cruz Islands (western Pacific)!
We just had an earthquake near the Santa Cruz Islands in the western Pacific Ocean. Here is the USGS web page for this earthquake. Here is a map that I quickly put together with the moment tensor from the M…
Earthquake in the Solomons!
While I was away from the office, we had a M 6.7 earthquake near the Solomon Islands. Here is a link to the USGS website for the M = 6.7 and M = 6.0 earthquakes. While the epicenter plots near…
Andaman Sea Earthquake!
Today we had a small earthquake in the Andaman Sea, west of Thailand and east of the Andaman Isles (India). The Andaman Sea is a region of backarc spreading and connects the Sumatra fault (a (strike-slip) sliver fault that accommodates…