Friday, April 18, 2008

Our Morning Earth Quake Report

Those unfamiliar may say, from looking at the maps below, that Springfield, Illinois appears very far from the epicenter. And that is true in a California sense, but because of the nature of the bedrock (very solid), and the type of fault (very deep), the energy from this fault travels almost completely undisturbed right from the Wabash fault to our location here in Springfield, Illinois. So it was quite a ride this morning.

Friday, April 18, 2008 at 09:36:56 UTC

Earthquake Location

World Location Earthquake Location
Earthquake Location
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Earthquake Location
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green

Earthquake Location, USGS Topographic Map
USGS Topographic Map, Resolution: 16.0 meters/pixel

1 km

Earthquake Location, USGS Aerial Photo
USGS Aerial Photo, Resolution: 16.0 meters/pixel

1 km

Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver

Magnitude 5.4 - ILLINOIS

2008 April 18 09:36:56 UTC

Versión en Español

Earthquake Details

Location38.520°N, 87.873°W
Depth5 km (3.1 miles) set by location program
  • 12 km (7 miles) E (90°) from West Salem, IL
  • 13 km (8 miles) NE (53°) from Bone Gap, IL
  • 14 km (9 miles) W (266°) from Allendale, IL
  • 36 km (22 miles) WSW (241°) from Vincennes, IN
  • 67 km (41 miles) NNW (335°) from Evansville, IN
  • 206 km (128 miles) E (93°) from St. Louis, MO
Location Uncertaintyhorizontal +/- 4.1 km (2.5 miles); depth fixed by location program
ParametersNST=135, Nph=135, Dmin=31 km, Rmss=1.61 sec, Gp= 32°,
M-type=moment magnitude (Mw), Version=8
Event IDus2008qza6
  • This event has been reviewed by a seismologist.
  • Did you feel it? Report shaking and damage at your location. You can also view a map displaying accumulated data from your report and others.

Here's what the local newspaper SJ-R has to say:

Updated: 5.4 earthquake rocks Illinois; also felt in Ohio and Indiana


Hundreds of Springfield-area residents were shaken awake this morning when they felt the rumblings of a
5.4-magnitude earthquake centered near West Salem.

No damage and no injuries have been reported here. The trembling, just before 4:37 a.m., lasted about 15 seconds.

Dispatchers at Sangamon County 911 and local police departments received numerous phone calls from residents wondering what was going on or reporting someone was in their home.

911's phone lines temporarily went down after the earthquake, but it was not immediately known if that was a result of the trembling.

The quake was centered 6 miles from West Salem, Ill., and 66 miles from Evansville, Ind.

The quake shook tall buildings in Chicago's Loop, 240 miles north of the epicenter, and in downtown Indianapolis, about 160 miles northeast of the epicenter.

Residents in Cincinnati and St. Louis also reported feeling the earth shake.

"It shook our house where it woke me up," said David Behm of Philo, 10 miles south of Champaign. "Windows were rattling, and you could hear it. The house was shaking inches. For people in central Illinois, this is a big deal. It's not like California."

The Associated Press contributed to this report.


Prof. Goldblatt Ph.D. said...

It woke me up 4:47am. Could feel it when I stood up. Wow, got the adrenaline going! Items on shelf were rattling. Well, I guess I lived through the "big" one of 2008.

I woke up to a creaking sound of my house and my bed was shaking for a good solid 20 seconds. It was the most eerie feeling... as if some stranger had entered my room and began gently rocking my bed left to right, silently.


--- Leland Milton Goldblatt, Ph.D. ®
Distinguished Professor

per fanberg said...

this was only a little quake the big one is soon to follow. m 6.5 - 7.8 there will be damage beyond your imagination, beware, be safe, i have spoken...

Carlo said...

Good JOb! :)

email jp






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