And free books, too
We’ll begin with the free books.
We were once buried in books.
It was at 0136 hours on 3 September 2000 and we were sitting in our recliner in the livingroom of our apartment in Napa California when the lights went out and we were pummeled repeatedly by invisible assailants.
It was a magnitude 5.2 earthquake, and our assailants were books, an avalanche vomited forth by falling and collapsing bookcases.
We’re moving this weekend, and we again are buried in books, too many to carry south to L.A., so every day this week we’re putting lots of them out on the media between sidewalk and street, free for one and all.
The address is 2032 Prince Street in Berkeley [one house south of Shattuck Avenue between the Starry Plow and the Ashby BART station], and subjects range for brain/mind science to history, science, biography, media, and much more.
Fresh offerings daily through Saturday.
And the afterslips from another Napa quake
A fascinating story from the Massachusetts Institute of Technology:
Nearly two years ago, on August 24, 2014, just south of Napa, California, a fault in the Earth suddenly slipped, violently shifting and splitting huge blocks of solid rock, 6 miles below the surface. The underground upheaval generated severe shaking at the surface, lasting 10 to 20 seconds. When the shaking subsided, the magnitude 6.0 earthquake — the largest in the San Francisco Bay Area since 1989 — left in its wake crumpled building facades, ruptured water mains, and fractured roadways.
But the earthquake wasn’t quite done. In a new report, scientists from MIT and elsewhere detail how, even after the earthquake’s main tremors and aftershocks died down, earth beneath the surface was still actively shifting and creeping — albeit much more slowly — for at least four weeks after the main event. This postquake activity, which is known to geologists as “afterslip,” caused certain sections of the main fault to shift by as much as 40 centimeters in the month following the main earthquake.
This seismic creep, the scientists say, may have posed additional infrastructure hazards to the region and changed the seismic picture of surrounding faults, easing stress along some faults while increasing pressure along others.
The scientists, led by Michael Floyd, a research scientist in MIT’s Department of Earth, Atmospheric and Planetary Sciences, found that sections of the main West Napa Fault continued to slip after the primary earthquake, depending on the lithology, or rock type, surrounding the fault. The fault tended to only shift during the main earthquake in places where it ran through solid rock, such as mountains and hills; in places with looser sediments, like mud and sand, the fault continued to slowly creep, for at least four weeks, at a rate of a few centimeters per day.
“We found that after the earthquake, there was a lot of slip that happened at the surface,” Floyd says. “One of the most fascinating things about this phenomenon is it shows you how much hazard remains after the shaking has stopped. If you have infrastructure running across these faults — water pipelines, gas lines, roads, underground electric cables — and if there’s this significant afterslip, those kinds of things could be damaged even after the shaking has stopped.”
There’s lots more, after the jump. . .