Mag 6.4, Triple Point -Juan de Fuca (Gorda), N America, Pacific Plates

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Discussion Overview

The thread discusses a magnitude 6.4 earthquake that occurred near Ferndale, California, focusing on its impact, aftershocks, and historical context related to the Juan de Fuca plate. The discussion includes reports of damage, power outages, and fatalities, as well as references to previous seismic events in the region.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Post 1 reports the earthquake's details, including its magnitude, location, depth, and the occurrence of aftershocks, along with significant power outages affecting over 70,000 residents.
  • Post 2 mentions building damage and reports of fatalities, expressing hope for no further casualties.
  • Post 3 clarifies the location of a previous earthquake, asserting that the 6.2 quake occurred onshore, southeast of the recent event, and provides its details.
  • Post 4 updates on power restoration efforts, indicating a target time for restoration.
  • Post 5 revises earlier reports, stating that there are no confirmed fatalities but mentions injuries and a structure fire complicated by broken water mains.
  • Post 6 confirms two fatalities related to medical emergencies during the earthquake, providing details about the victims' ages.
  • Post 7 recalls a past earthquake near Olympia, WA, suggesting it was likely caused by the same tectonic activity associated with the Juan de Fuca plate, sharing a personal experience of that event.

Areas of Agreement / Disagreement

Participants express varying reports on the impact of the earthquake, including differing accounts of fatalities and damage. There is no consensus on the overall effects or the accuracy of initial reports.

Contextual Notes

Some statements rely on evolving information regarding casualties and damage, and there are discrepancies in reports about the previous earthquake's location and impact.

Astronuc
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M 6.4 - 12km WSW of Ferndale, CA​

https://earthquake.usgs.gov/earthquakes/eventpage/nc73821036/executive
  • 2022-12-20 10:34:25 (UTC)
  • 40.523°N 124.393°W
  • 16.1 km depth
https://en.wikipedia.org/wiki/Juan_de_Fuca_Plate#/media/File:Juan_de_fuca_plate.png

Numerous aftershocks (Mag 2-4) occurring inland. Power outages reported in Humboldt county.

M 4.6 - 6km WNW of Rio Dell, CA​

  • 2022-12-20 10:39:02 (UTC)
  • 40.515°N 124.174°W
  • 24.2 km depth

According to PowerOutage.us, more than 70,000 people across Humboldt County, a majority of residents, were without power early Tuesday. Pacific Gas & Electric was working to restore power, Karges said, adding that "there is no time available" for when services might come back online.
https://www.yahoo.com/news/magnitude-6-4-earthquake-strikes-111116652.html
State Route 11 at Fernbridge, the county’s oldest bridge, was closed early Tuesday because the bridge was cracked in four places, according to the California Highway Patrol incident log. Pictures on Twitter showed the concrete was fractured in several places. Crews were dispatched for an integrity check, Carsey said.

Exactly a year ago, the same area was hit by a magnitude 6.2 quake that shattered windows and caused some damage.
 

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Earth sciences news on Phys.org
Yes, a decent quake, some building damage and I understand 2 deaths reported, hopefully no more
 
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There was an M6.8 earthquake near Olympia, WA on Feb. 28, 2001, caused most likely by movement of the same plate, the Juan de Fuca plate. I remember that quake distinctly, as I was driving south on I-405 when I felt the whole highway moving under me for about 10 seconds. I thought there was something wrong with my car, but found out later that it was an earthquake.
 

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