Tag Archives: Swarm of Earthquakes

Swarm of Earthquakes hit Southern California

So-Cal-Earthquake-map

Important Takeaways:

  • Two sets of earthquake swarms have hit California. What’s going on along the Mexico border?
  • Another earthquake swarm has been rumbling along the California-Mexico border.
  • More than two dozen quakes greater than magnitude 2.5 have occurred since just after midnight Saturday, with epicenters about 175 miles southeast of downtown Los Angeles and 100 miles northeast of San Diego, according to the U.S. Geological Survey.
  • They have occurred largely along farmland between the towns of Brawley and Imperial in Imperial County. The largest quake was a magnitude 3.9 that struck at 4:05 p.m. Saturday, bringing light shaking to the Imperial Valley as well as south of the border and rattling Mexicali.
  • An even larger earthquake — a magnitude 4.1 — occurred at 5:17 a.m. Monday about 28 miles northwest of the swarm that began Saturday.
  • The epicenter of that quake was in a remote desert area east of Anza-Borrego Desert State Park, and weak shaking was felt as far away as San Diego, parts of Orange County, Temecula, the Coachella Valley, El Centro and Holtville.
  • A separate swarm of earthquakes occurred a week ago, about 40 miles southeast of the most recent quake activity. Last week’s swarm occurred about 18 miles southeast of Mexicali in Baja California, with the largest a magnitude 4.2 that was felt as far away as El Centro in California and Yuma, Ariz.

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Swarm of earthquakes on the Juan de Fuca Ridge

Juan-De-Fuca-Ridge

Important Takeaways:

  • Underwater volcano off northwestern US could BLOW in weeks – as 300m-long stretch is hit with ‘great swarm’ of earthquakes
  • Scientists have detected a ‘great swarm’ of earthquakes off the coast of Washington clocking as many as 200 in a single hour during one day.
  • Geologists at the University of Washington said the quakes could lead to the Juan de Fuca Ridge erupting within a few weeks or years – but the effects are believed to be mild and not likely impact anyone on land.
  • The underwater volcano sits more than 16,000 feet below the Pacific Ocean and about 150 miles off the coast of Washington.
  • On March 6, the group’s real-time monitoring network detected the earthquakes, which registered a 4.1 magnitude
  • The ‘great swarm’ of earthquakes followed multiple days of increasingly frequent quakes, according to Ocean Networks Canada (ONC), which is collecting the data for researchers to study.
  • The spike indicated a possible ‘impending magmatic rupture,’ the research group reported.
  • Officials at ONC have stressed that the effects will be mild and local, and that residents on land are extremely unlikely to feel the quake.
  • Nor is it likely to trigger tsunami activity, as a tsunami is set off by a different type of tectonic plate boundary movement: pushing together and slipping, rather than pulling apart.

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