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1998 Pymatuning earthquake

Field	Value
name	1998 Pymatuning earthquake
map2	{{Location map+	USA Pennsylvania
{{Location map~	Pennsylvania	lat	42.129	long=-80.085	label=Erie	label_size=100	position=right	mark=Green pog.svg}}
{{Location map~	Pennsylvania	lat	40.439	long=-79.976	label=Pittsburgh	label_size=100	position=right	mark=Green pog.svg}}
{{Location map~	Pennsylvania	lat	41.495	long=-80.388	mark=Bullseye1.png	marksize=40}}
width	260
float	right
relief	yes
pushpin_map
tags	y
timestamp	1998-09-25 19:52:52
anss-url	usp0008vh3
local-date
local-time	03:52 p.m. EDT
magnitude
depth	5 km
location
fault	Southern Great Lakes seismic zone
type	Oblique-slip reverse
affected	Pennsylvania, Ohio
intensity
pga
pgv
isc-event	1206808

| anss-url = usp0008vh3 | local-date = | local-time = 03:52 p.m. EDT | isc-event = 1206808 The 1998 Pymatuning earthquake occurred in the U.S. state of Pennsylvania on September 25 at 19:52 UTC. With a magnitude of 5.2 , it was the largest recorded earthquake in Pennsylvania's history.

Earthquake

The earthquake's epicenter was in the Southern Great Lakes seismic zone, about 25 km southwest of Meadville; its depth was 5 km. The earthquake caused minor damage in towns near its epicenter and was felt in the states of Ohio, Pennsylvania, Indiana, Michigan, New York, Illinois and New Jersey, as well as Southern Ontario in Canada.

Hydrologic occurrences

After the earthquake many wells in the epicentral region began to dry up, while new springs and old wells began to flow. A three-month date range revealed 120 dry household-supply wells on the ridge of Jamestown and Greenville. Declines of up to 100 feet (30 m) were observed on a ridge where at least 80 of these wells resided. The degree of the damage varied. Some of the wells lost all power or could barely hold their yields and some of the water in wells turned black or began to smell of sulfur.

The most likely cause of the wells drying was because of the increase in hydraulic conductivity or "hydraulic islands" of shale rock under this area caused by the earthquake. The quake affected the existing faults and created new faults in the shale. This created more permeability for the water to leak down from the hilltops on the ridge down to the valleys following the contours of the Meadville shale down to the 14–18 square km area of the valley.

References

"USGS focal mechanism". United States Geological Survey.
"USGS ShakeMap data". United States Geological Survey.
(2000). "Faulting Parameters of the September 25, 1998 Pymatuning, Pennsylvania Earthquake". Seismological Research Letters.
"USGS differential magnitude list". United States Geological Survey.
(November 10, 2003). "Magnitude 5.2 Pennsylvania". United States Geological Survey.
(2007). "Pymatuning earthquake in Pennsylvania and Late Minoan Crisis on Crete". Water Science and Technology: Water Supply.

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

1998-natural-disasters-in-the-united-states 1998-earthquakes 1998-in-pennsylvania earthquakes-in-the-united-states natural-disasters-in-pennsylvania september-1998-in-the-united-states

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