Category Archives: San Andreas

Earthquake Report: 1989 Loma Prieta!

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 … Continue reading

Posted in earthquake, education, geology, plate tectonics, San Andreas, San Francisco, strike-slip, Transform, Uncategorized

Earthquake Report: Ridgecrest Update #3 Literature Review

I have reviewed a small portion of the literature for the tectonics of the northern Eastern California shear zone, Owens Valley fault, Garlock fault, etc. I have a basic knowledge of this region and have attended several Pacific Cell Friends … Continue reading

Posted in earthquake, education, geology, plate tectonics, San Andreas, strike-slip, Transform

Earthquake Report: Ridgecrest Update #2

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 … Continue reading

Posted in earthquake, education, geology, plate tectonics, San Andreas, strike-slip

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 … Continue reading

Posted in earthquake, education, geology, San Andreas, strike-slip

Earthquake Report: Mendocino triple junction

Well, I was on the road for 1.5 days (work party for the Community Village at the Oregon Country Fair). As I was driving home, there was a magnitude M 5.6 earthquake in coastal northern California. I didn’t realize this … Continue reading

Posted in cascadia, College Redwoods, earthquake, education, geology, gorda, HSU, humboldt, mendocino, mendocino, pacific, plate tectonics, San Andreas, strike-slip, subduction, Transform

Earthquake Report: San Clemente Island

Well, yesterday was the start of a sequence of earthquakes offshore of San Clemente Island, about 100 km west of San Diego, California. The primary tectonic player in southern CA is the Pacific – North America plate boundary fault, the … Continue reading

Posted in earthquake, education, geology, pacific, plate tectonics, San Andreas, strike-slip

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 … Continue reading

Posted in earthquake, education, geology, los angeles, pacific, plate tectonics, San Andreas, strike-slip, Transform

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 … Continue reading

Posted in collision, earthquake, education, geology, los angeles, pacific, plate tectonics, San Andreas, strike-slip

Earthquake Report: Channel Islands

I was finally getting around to writing a report for the deep Bolivia earthquake (Bolivia report here), when a M 5.3 earthquake struck offshore of the channel islands (south of Santa Cruz Island, west of Los Angeles). As is typical … Continue reading

Posted in earthquake, education, geology, los angeles, pacific, plate tectonics, San Andreas, strike-slip, Transform

Earthquake Report: 1971 Sylmar, CA

This earthquake was the second earthquake in the state of CA to lead to major changes in how people in the state handled earthquake hazards and risk and today is the 47th anniversary of this earthquake. The first important earthquake … Continue reading

Posted in collision, earthquake, education, geology, los angeles, plate tectonics, San Andreas