Magnitude 4.2 ILLINOIS
2004 June 28 06:10:51 UTC
Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver
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Magnitude | 4.2 | |
| Date-Time |
Monday, June 28, 2004 at 06:10:51 (UTC) - Coordinated Universal Time Monday, June 28, 2004 at 01:10:51 AM local time at epicenter Time of Earthquake in other Time Zones |
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| Location | 41.44N 88.93W | ||
| Depth | 5.0 kilometers | ||
| Region | ILLINOIS | ||
| Reference |
15 km (10 miles) NNW of Ottawa, Illinois 60 km (40 miles) SW of Aurora, Illinois 115 km (70 miles) WSW of Chicago, Illinois 190 km (120 miles) NNE of SPRINGFIELD, Illinois |
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| Location Quality | Error estimate: horizontal +/- 5.0 km; depth fixed by location program | ||
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Location Quality Parameters |
Nst=37, Nph=37, Dmin=196.7 km, Rmss=0.97 sec, Erho=5.0 km, Erzz=0 km, Gp=73.3 degrees | ||
| Source | USGS NEIC (WDCS-D) | ||
| Remarks | mbLg 4.5 (GS). Felt (V) at Earlville, Oglesby, Ottawa and Tonica; (IV) at Chillicothe, Dalzell, Frankfort, Granville, Hinckley, Hinsdale, Ladd, La Salle, Lockport, Marseilles, Mendota, Monee, Paw Paw, Peru, Princeton, Rock Island, Seneca, Sheridan, Somonauk, Sterling, Streator, Sublette and Utica. Also felt (IV) at Milwaukee, Wisconsin. Felt in Illinois, Indiana, Iowa, Michigan, Missouri and Wisconsin. |
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Did You Feel It?
Theoretical P-Wave Travel Times
Current information about the rate at which earthquakes occur in different areas, and on how far strong shaking extends from the earthquake source. Earthquake Information for ILLINOIS Earthquakes: Frequently Asked Question
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Scientific & Technical
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USGS National Seismic Hazard Mapping Project
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NB:
The official magnitude for this earthquake is indicated at the top of this page.
This was the best available estimate of the earthquake's size,
at the time that this page was created. Other magnitudes associated
with web pages linked from here are those determined at various times
following the earthquake with different types of seismic data.
Although, given the data used, they are legitimate estimates of magnitude
they are not considered the official magnitude.
The region name is an automatically generated name
from the Flinn-Engdahl (F-E) seismic and geographical regionalization scheme.
The boundaries of
these regions are defined at one-degree intervals and therefore differ from
irregular political boundaries.
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