Well, I prepared this report for the 30th anniversary of the 18 Oct 1989 Loma Prieta M 6.9 earthquake in central California, a.k.a. the World Series Earthquake (it happened during the 1989 World Series game at Candlestick Park in San…
Earthquake Report: Ridgecrest Update #1
Summary of Reports for the Ridgecrest Earthquake Sequence The original Earthquake Report for this widely felt sequence is here. The update #1 Earthquake Report for this widely felt sequence is here. The update #2 Earthquake Report for this widely felt…
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: 2018 Summary
Here I summarize Earth’s significant seismicity for 2018. I limit this summary to earthquakes with magnitude greater than or equal to M 6.5. I am sure that there is a possibility that your favorite earthquake is not included in this…
Earthquake Report: Bering Kresla Update #1
Well, the USGS updated their earthquake mechanism (moment tensor) to be more steeply dipping, showing a more vertical fault possibly. This makes more sense given the historic earthquakes in this region and our knowledge of the history of this complicated…
Earthquake/Landslide/Tsunami Report: Donggala Earthquake, Central Sulawesi: UPDATE #1
We continue to learn more each day as people collect additional information. Here is my initial Earthquake Report for this M 7.5 Donggala Earthquake. In short, there was an earthquake with magnitude M = 7.5 on 2018.09.28. Minutes after the…
Earthquake Report: Lombok, Indonesia: Update #1
Yesterday morning, as I was recovering from working on stage crew for the 34th Reggae on the River (fundraiser for the non profit, the Mateel Community Center), I noticed on social media that there was an M 6.9 earthquake in…
Earthquake Report: Channel Islands Update #1
Well well. There was lots of interest in this M 5.3 earthquake offshore of Ventura/Los Angeles, justifiably so. Southern California is earthquake country. Here is an update. There was lots of information that I was trying to incorporate and I…
Earthquake Report: Papua New Guinea: Update #1
The aftershocks are still coming in! We can use these aftershocks to define where the fault may have slipped during this M 7.5 earthquake. As I mentioned yesterday in the original report, it turns out the fault dimension matches pretty…
Earthquake Report: 1960 Valdivia, Chile M 9.5
In commemoration of the #EarthquakeCup, I have put together a summary for the largest instrumentally recorded earthquake, the M 9.5 1960 Valdivia, Chile Earthquake. The Peru-Chile trench is quite active and generated Great earthquakes (M>8) in 1985, 2010, 2014, and…