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EARTHQUAKE ALERT BULLITEN NO.: 97-011
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Preliminary data indicates a significant earthquake has occurred:
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REGIONAL LOCATION:

PRELIMINARY MAGNITUDE:

MOMENT MAGNITUDE:

GREENWICH MEAN DATE:
GREENWICH MEAN TIME:
LATITUDE:
LONGITUDE:
FOCAL DEPTH (km):
ANALYSIS QUALITY

MICHOACAN, MEXICO

6.8 Ms

7.1 (NEIC)

97/01/11
20:28:25
18.247N:
102.80W
13.0 km
A
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NOTATIONS:
UPDATE!!


NEIC and Harvard have updated the January 11 Michoacan earthquake to a Moment magnitude of Mw 7.1. The focal mechanism indicated the quake triggered along a moderate east-dipping northwest trending plane with nearly pure thrust motion. This is typical orientation of the quakes along the Central American subduction zone, however, the depth suggusts the quake occurred along a thrust fault in the overlying North American plate. There have been a number of aftershocks, none registering in the 5.0 range as of yet.


Wire reports indicated significant damage occurred in the towns of Arteaga, Aguililla and Playa Azil. Some structures have collapsed. The Arteaga hospital sustained severely cracked walls, and was declared unsafe. Estimates put at least 80% of the structures sustained some to moderate damage and over 200 people were reported injuried. One person, a boy, sustained a blow to the head and was taken to Mexico City. A bridge near Guadalajara was damaged and power was lost in many communities and neighborhoods of Mexico City. Widespread nonstructural occurred.


The quake was centered in the coastal mountains of the Sierra Madre del Sur about 220 miles west-southwest of Mexico City. It occurred in a remote region about 30 miles west of Presa del Infirrnillo, a prominent reservoir in western Michoacan, or about 50 miles inland from the coast. It was centered near the location of the powerful 8.1 earthquake of 1985 that killed over 5,000 people in Mexico City.

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Subtract 8 hours to obtain PST or 5 hours for EST
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Seismo-Watch Earthquake Bulletin Archive:
https://seismo-watch.com/EQS/AB/ABA.html
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Sources:
? US Geological Survey, Nat.'l Earthquake Info. Center, Golden, CO
? Harvard Geophysical Observatory, Harvard Univ., Cambridge, MA
? Inter'l. Data Center, Ctr. for Monitoring Research, Arlington, VA
? various wire reports and/or personal communications
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All data are preliminary and subject to change.
Copyright ? 1996 Advanced Geologic Exploration
Re-transmission prohibited. All rights reserved.
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