geology - Jay Patton online

18 April 1906 San Francisco Earthquake

Today is the anniversary of the 18 April 1906 San Francisco Earthquake. There are few direct observations (e.g. from seismometers or other instruments) from this earthquake, so our knowledge of how strong the ground shook during the earthquake are limited…

Earthquake Report: central Aleutians

A couple days ago, in my inbox, there was an email from the Pacific Tsunami Warning Center about an earthquake along the Aleutian Islands, near Rat Island, Alaska. However, this earthquake was not along the megathrust subduction zone fault there…

Earthquake Report: Northern Alaska

At shortly before 13:30 today in northern Alaska there was a large earthquake, with a magnitude of M=5.1 (now M 5.0). https://earthquake.usgs.gov/earthquakes/eventpage/ak0193wxcfea/executive Many of us are familiar with the Good Friday earthquake, a megathrust subduction zone earthquake. This earthquake has…

Earthquake Report: Peru

On 01 March 2019 there was an intermediate depth earthquake near the border of Peru and Bolivia. In the past century, this is the first earthquake in this area at this depth. There are some historic quakes to the east,…

Earthquake Report: Ecuador

Well, as I was getting up this morning, my social media feed was abuzz about the intermediate depth earthquake in Peru. While it was quite deep ( Magnetic Anomalies In the map below, I include a transparent overlay of the…

Earthquake Report: Guatemala and Mexico

This morning (my time) there was a moderately deep earthquake along the coast of southern Mexico and northern Guatemala. Here is my Temblor article about this M=6.6 earthquake and how it might relate to the 2017 M=8.2 quake. https://earthquake.usgs.gov/earthquakes/eventpage/us2000jbub/executive Offshore…

Earthquake Report: Chile

There was a very interesting earthquake in central coastal Chile yesterday. I spent some time putting together a Temblor article about it. https://earthquake.usgs.gov/earthquakes/eventpage/us2000j6hy/executive I also took the opportunity to create an interpretive poster in portrait format to help with people…