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Category Archives: geology
Earthquake Report: Ridgecrest Update #2
Well Well Well The story continues to unfold. My original Earthquake Report for this widely felt sequence is here. My update #1 Earthquake Report for this widely felt sequence is here. Here is the Earthquake Engineering Research Institute (EERI) Learning … Continue reading
Posted in earthquake, education, geology, plate tectonics, San Andreas, strike-slip
Earthquake Report: Halmahera, Indonesia
Well, yesterday I was preparing some updates to the Ridgecrest Earthquake following my field work with my colleagues at the California Geological Survey (where I work) and the U.S. Geological Survey. We spent the week documenting surface ruptures associated with … Continue reading
Posted in collision, earthquake, education, geology, Indonesia, plate tectonics, tsunami
Earthquake Report: Ridgecrest Update #1
My original Earthquake Report for this widely felt sequence is here. There have been well over 1000 aftershocks with magnitudes M ≥ 0.5. Last night there was the largest aftershock (so far) a magnitude M 5.4 earthquake. It is clear … Continue reading
Posted in earthquake, education, geology, San Andreas, strike-slip
Earthquake Report: Ridgecrest, CA
Well, happy fourth of July! There was a good sized earthquake in southern California today. The largest earthquake since the 1999 M 7.1 Hector Mine earthquake. (The 2003 San Simeon earthquake was larger, but much farther to the west, at … Continue reading
Posted in earthquake, education, geology, plate tectonics, strike-slip
Earthquake Report: Indonesia
I had been making an update to an earthquake report on a regionally experienced M 5.6 earthquake from coastal northern California when I noticed that there was a M 7.3 earthquake in eastern Indonesia. This earthquake is in a region … Continue reading
Posted in earthquake, education, Indonesia, New Zealand, pacific, plate tectonics, strike-slip, Transform
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: Kermadec Trench
There was just an earthquake associated with the plate boundary that forms the Kermadec Trench, a deep oceanic trench that extends north from New Zealand, towards the Fiji Islands. A minor tsunami (~25 cm in size) has been recorded at … Continue reading
Posted in earthquake, education, geology, New Zealand, pacific, plate tectonics, subduction, tsunami
Earthquake Report: Chile
This morning (my time) there was a magnitude M 6.4 earthquake offshore of Chile. While it was in the correct location to possibly cause a tsunami, the magnitude was too small. The major plate boundary here is the megathrust subduction … Continue reading
Posted in earthquake, education, geology, pacific, plate tectonics, subduction
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
Earthquake Report: Peru
Just a moment ago, there was an intermediate depth Great Earthquake (magnitude M≥8.0) beneath Peru. I was heading to bed at about 1:10 local time (Sacramento, CA) when I noticed a tweet from Dr. Anthony Lomax (presenting his first motion … Continue reading
Posted in earthquake, education, Extension, geology, pacific, plate tectonics, subduction