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97815 |
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Date: February 22, 2024 at 11:30:20
From: jordan, [DNS_Address]
Subject: Washington hit by series of 3.0-4.3 quakes since 2022 |
URL: https://pnsn.org/earthquakes/notable |
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3.5 2024/01/14 23:25:05 PST 43.5 km
4.0 2023/12/24 07:14:04 PST 52.4 km
3.1 2023/11/24 00:16:16 PST 20.6 km
3.1 2023/11/16 16:47:40 PST 18.1 km
4.3 2023/10/08 19:21:08 PDT 57.0 km
3.7 2022/09/08 01:08:25 PDT 23.3 km
same order
24.0 km (14.88 miles) SE from Port Angeles, WA
25.4 km (15.75 miles) WNW from Poulsbo, WA
25.4 km (15.75 miles) S from Longview, WA
22.0 km (13.64 miles) SSW from Mount Vernon, WA
10.2 km (6.32 miles) SSE from Port Townsend, WA
14.3 km (8.87 miles) NNW from Poulsbo, WA
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Responses:
[97820] [97822] |
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97820 |
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Date: February 22, 2024 at 22:26:23
From: NW Watcher, [DNS_Address]
Subject: Re: Washington hit by series of 3.0-4.3 quakes since 2022 |
URL: https://www.earthquakescanada.nrcan.gc.ca/recent/maps-cartes/index-en.php?tpl_region=west |
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I totally agree. I've been watching the USGS, UW, and
the Canadian (earthquakescanada.nrcan.gc.ca) seismic
monitors for a long, long time. Ever since the Indian
Ocean basin wide event in 2004 we have seen a slow
creep of large quakes inch Northward into Japan,
Russia, and continuing across Alaska. Each time there
has been a large quake, seismic activity was sent
rippling across Alaska. It then travels South into
Canada along the ring of fire. The amount of South
bound activity can only be observed on the Canadian
Seismic Network. In the last couple of years the amount
of activity has increased tremendously. The NW plates
are under tremendous strain. So much so, that when a
large quake occurs elsewhere in the entire world,
seismic activity drops off in the Pacific Northwest.
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Responses:
[97822] |
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97822 |
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Date: February 23, 2024 at 06:54:46
From: Redhart, [DNS_Address]
Subject: Re: Washington hit by series of 3.0-4.3 quakes since 2022 |
URL: https://www.nytimes.com/interactive/2024/02/13/climate/flooding-sea-levels-groundwater.html |
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There are geological processes going on, for sure..as
they always have for millions of years. But, there's
another bug in the ointment of land changes: human
activity.
There was a map in the New York Times showing how the
east coast is "sinking". One of the culprits appears to
be the pumping of groundwater :
"The East Coast is Sinking
New satellite-based research reveals how land along the
coast is slumping into the ocean, compounding the
danger from global sea level rise.
A major culprit: overpumping of groundwater"
The link takes you to an interactive map of the east
coast and the changes in elevation.
Changes of these types..groundwater changes, can
contribute to seismic activity as the land has to
readjust as it sinks (or grows) and an also contribute
to seismic activity.
The central valley in California also has areas of
"sinking" due to over pumping of agricultural ground
water that has been studied over years..the recent
drought accelerated this as ground water became used
even faster as reservoirs were low.
Another type of human activity that can elevate seismic
risk is fracking and pressurized steam/water injection
in oil/gas rich areas of the U.S. (recent Oklahoma and
Texas seismic activity related to this effect has been
recently reported in the news).
So, while natural geological evolution and faults and
the processes that drive them certainly should be
looked at, we also need to look at the changes human
activity also cause when seismic activity is being
looked at and sudden increases in that activity beyond
the normal, background levels.
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Responses:
None |
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