Regional Location: Preliminary Magnitude: Greenwich Mean Date: Greenwich Mean Time: Latitude: Longitude: Focal Depth:		NISQUALLY, WASHINGTON Md 4.3 (PNSN) 01/07/22 15:13:52 (8:14 a.m. local time) 47.082N 122.683W 50.2 km (31.2 miles)
		Seismo-Watch Significant Earthquake Reports- No. 01-026
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		OLYMPIA, WASHINGTON, July 22, 2001 (Seismo-Watch) -- Preliminary data indicates that an earthquake registering Md 4.3 (PNSN) occurred at 15:13:52 utc (8:14 a.m. local time, July 22 about 39 miles southwest west of Seattle and 10 miles northeast of Olympia along the southern margin of the Puget Sound near Nesqually. It was centered at a depth of 50 km (31 miles) below the surface and felt by thousands people, but it was too light to cause any damage. Seismo-Watch EQ Flash! Alert Bulletins subscribers received a notification of the earthquake within minutes of the shaking. You should subscribe to the service too! It's FREE and Fast! NOW!! Wireless EQ Flash! via pager, cell phone or PDA's! More info. The quake was centered in the Nisqually delta close to where Interstate 5 crosses the Nesqually River. See a Topo Zone location map. This is nearly the exact location of the February 28 Nesqually M6.8 earthquake and considering the depths for the two quakes are also similar, indicates that today's M4.3 temblor was an aftershock to the larger shock. We do not have a fault plane solution nor a moment magnitude analysis for this event as of yet. Foreshocks and aftershocks There were foreshocks or aftershocks to today's quake. It was the largest aftershock to the Nesqually M6.8 earthquake thus far, and in fact, it was the only aftershock to the big jolt. Felt Earthquake Reports The quake was widely felt throughout the southern Puget Sound and as far away as Port Angeles, Monroe and Morton. Deep quakes like this are often felt over a wide region on the surface. Most people felt a very weak shaking of the ground lasting about 4-8 seconds. Windows rattled slightly and hanging plants swung. There are unconfirmed reports of light items toppling from shelves in Puyallup area. Some people were stirred from sleep and others were frightened, probably remembering the long, scary shaking from the Nesqually M6.8 earthquake. Those lasted for 20-30 seconds. Some could tell it was a deep quake by the long shaking periods. Background Information The Nesqually M6.8 earthquake caused at least $2 billion in damage and was declared a Federal Disaster Area. The State Capital building suffered at least $20 million in damage. Most of the damage occurred in the older building stock in the region. It was the largest earthquake in the United States since the Lavic Lake (Hector Mine) M7.1 earthquake in October 1999, but the most costly since the Northridge M6.7 earthquake in January 1994. Fortunately, there were no deaths associated with the Nesqually earthquake. More information will be provided as soon as possible and this page will automatically refresh every 2 minutes to give you the latest news. Additional Seismic information links: Seismo-Watch Links to Pacific Northwest Activity USGS Recent Earthquakes Page USGS Community Intensity Report Seismograms of the earthquake series from nearby stations: None at this time. Mainstream media news reports: Earthquake Rattles Puget Sound Area (Associated Press) Report update: 3:40 p.m., July 22, 2001
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