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HMC Seismology - Edwards Geophysics Laboratory
The Edwards Geophysics Laboratory, located in Parsons 155, has been in operation
since the construction of the Libra complex on the HMC campus during the
1970's. Professors Alfred Focke and A. E. Stoddard founded the Seismology Lab during
this period, and advised a large number of student research projects using the
instruments.
The instrumentation in the Seismo Lab formerly consisted of
three orthogonally oriented Benioff short period (~1 Hz) seismographs and
three long-period (< .05 Hz) instruments; two mercury capacitance tiltmeters (horizontal components),
and a LaCoste-Romberg geodetic gravimeter (vertical). The location of the laboratory is Lat.: 34.1066 N, Long.: 242.2877 E, Height: 365 m.
In the summer of 2006, a new broadband seismometer was installed replacing the old short period and long period instruments. The system is currently in a shakedown period during which the performance of the new seismometer is being evaluated. Eventually we expect to provide interactive online access to the data through this web page. For the time being however, the plots presented below provide a 24-hour synopsis of the latest recorded data, and are refreshed hourly (refresh your web browser to see updates).
A principal purpose of this Seismo Lab Web Page is to provide community access
to data from and information about the Edwards Lab. As new capabilities are developed through student and faculty work, the information available through this page will evolve. Enjoy this work, and check back later for new developments!
Below are the HMC Seismo Lab broadband 24-hour drum plots:
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Recent Events of Interest as Recorded at the HMC Seismo Lab
- Ridgecrest, CA M=5.5 earthquake of
8/17/95
- Jalisco, Mexico Mw=7.8
earthquake of 10/9/95
- Egypt Ms=7.2
earthquake of 11/22/95
- Kurile Is. Ms=8.0
earthquake of 12/03/95
- Ridgecrest, CA M=5.2 aftershock of
1/7/96
- Mt. Baldy, CA M=3.0 earthquake of
2/12/96
- Seattle, WA M=5.4 earthquake of
5/03/96
- San Jose, CA M=4.7 earthquake of
5/21/96
- Aleutian Is., AK M=7.7 earthquake of
6/10/96
- Claremont, CA M=1.6 microearthquake of
9/13/96
- Coso region, CA M=5.1 earthquake of
11/27/96
- Diamond Bar, CA M=3.5 earthquake of
1/31/97
- Claremont, CA M=2.2 earthquake of
2/18/97
- Ontario, CA M=3.0 earthquake of
3/8/97
- Santa Cruz Islands M=7.6 earthquake of
4/21/97
- Northridge M=5.0 and 4.9 aftershocks of
4/26/97 and 4/27/97
- Yucaipa, CA M=4.0 earthquake of
12/5/97
- Chino, CA M=4.3 earthquake of
1/5/98
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Guide to Seismology-Related Resources Outside of HMC
Information on recent earthquake activity:
-
Master Directory USGS, USGS epicenters and magnitudes
-
California and Nevada seismicity, USGS epicenters and magnitudes continuously
updated
-
Los Angeles area seismicity, USGS epicenters and magnitudes continuously
updated
-
SF Bay area seismicity, USGS epicenters and magnitudes continuously
updated
-
Long Valley (Mammoth) seismicity, USGS epicenters and magnitudes continuously
updated
-
Parkfield CA seismicity, epicenters and magnitudes continuously
updated
-
Hawaii seismicity, USGS epicenters and magnitudes continuously
updated
-
Near Real-Time Earthquake Bulletin, NEIC, Lists the last 21 earthquakes world wide
-
World Seismicity, NEIC current world map
-
Significant Earthquakes of the Year, NEIC information compilation
-
Moment Tensor Solutions, NEIC solutions for recent earthquakes
- Older sites:
-
Worldwide 72-hour EQ List, epicenters and magnitudes continuously
updated
-
So. Cal. 72-hour EQ List, epicenters and magnitudes continuously
updated
-
Southern CA EQ Map, epicenters and magnitudes continuously
updated
-
Northern CA EQ Map, epicenters and magnitudes continuously
updated
-
Mammoth Lakes CA EQ Map, epicenters and magnitudes continuously
updated
Links to institutions with information on earthquakes and seismology:
- NEIC, National Earthquake Information Center
- USGS Pasadena, U.S. Geological Survey Southern California Office
- Caltech
Seismo Lab, lots of information on recent events and research
- SCEC, Southern California
Earthquake Center
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