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Landslides in El SalvadorEven before hurricane Ida slammed into El Salvador, three days of rain triggered deadly landslides that killed more than a hundred people. Heavy rain sets off landslides, but it may not be a matter of just washing loose dirt downhill. If that were the case, we would see only mud in the streets. I... |
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On OphiolitesSome friends of mine got it into their heads that they wanted to visit an ophiolite. As a reader of John McPhee's geology books, I thought "of course, what could be more distinctively Californian?" But as I researched and visited likely field sites and did some reading, the subject grew... |
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Wrestling with RocksYesterday I visited the Del Puerto Ophiolite, in preparation for a small field trip I'm planning later this month. Every time I go in the field I return amazed at the energy and insight of geologic mappers. Even though I followed a good field-trip guide, I found it difficult to discern everything... |
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How Long Do Aftershocks Last?The classroom treatment of aftershocks is fairly simple: An earthquake hits, and then a series of aftershocks occurs that is well summarized by three mathematical expressions called the Gutenberg-Richter relation, Bath's law and Omori's law. The first two relate the aftershocks to the mainshock i... |
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Peridotite: A New GalleryAfter a slow drive last month through the eastern Klamath Mountains, with many stops to take pictures and examine rocks, I now consider myself well acquainted with peridotite. That can be hard to do, because peridotite is almost all deep in the mantle and lower oceanic crust. And most of the peri... |
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What's a Geopark?I've cared about geoparks for several years, so I made sure to attend a session on geoparks at the Geological Society of America meeting, on 19 October. The most important news to me was that the National Park Service is collaborating with the GSA on a formal proposal for establishing geoparks in... |
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