Seismicity patterns in Southern California before and after the 1994 Northridge earthquake; a preliminary report

1995 ◽  
Author(s):  
Paul A. Reasenberg
Keyword(s):  
Preliminary Report ◽  
Southern California ◽  
Northridge Earthquake ◽  
Seismicity Patterns ◽  
Before And After ◽  
1994 Northridge Earthquake

scholarly journals Deformation following the 1994 Northridge Earthquake (M=6.7), Southern California

1998 ◽  
Vol 25 (14) ◽  
pp. 2725-2728 ◽  
Author(s):  
J. C. Savage ◽  
J. L. Svarc ◽  
W. H. Prescott ◽  
K. W. Hudnut
Keyword(s):  
Southern California ◽  
Northridge Earthquake ◽  
1994 Northridge Earthquake

scholarly journals State of stress before and after the 1994 Northridge Earthquake

1997 ◽  
Vol 24 (5) ◽  
pp. 519-522 ◽  
Author(s):  
Dapeng Zhao ◽  
Hiroo Kanamori ◽  
Douglas Wiens
Keyword(s):  
Northridge Earthquake ◽  
State Of Stress ◽  
Before And After ◽  
1994 Northridge Earthquake

scholarly journals Continuous monitoring of seismic energy release associated with the 1994 Northridge earthquake and the 1992 Landers earthquake

1996 ◽  
Vol 86 (1A) ◽  
pp. 255-258 ◽  
Author(s):  
Sharon Kedar ◽  
Hiroo Kanamori
Keyword(s):  
Frequency Band ◽  
Southern California ◽  
Seismic Energy ◽  
Northridge Earthquake ◽  
Time Frequency ◽  
Landers Earthquake ◽  
Long Period ◽  
1992 Landers Earthquake ◽  
Large Earthquakes ◽  
1994 Northridge Earthquake

Abstract We have developed a method to detect long-period precursors for large earthquakes observed in southern California, if they occur. The method allows us to continuously monitor seismic energy radiation over a wide frequency band to investigate slow deformation in the crust (e.g., slow earthquakes), especially before large earthquakes. We used the long-period records (1 sample/sec) from TERRAscope, a broadband seismic network in southern California. The method consists of dividing the record into a series of overlapping 30-min-long windows, computing the spectra over a frequency band of 0.00055 to 0.1 Hz, and plotting them in the form of a time-frequency diagram called spectrogram. This procedure is repeated daily over a day-long record. We have analyzed the 17 January 1994 Northridge earthquake (Mw = 6.7), and the 28 June 1992 Landers earthquake (Mw = 7.3). No slow precursor with spectral amplitude measured over a duration of 30 min larger than that of a magnitude 3.7 was detected prior to either event. In other words, there was no precursor whose moment was larger than ∼0.003% of the mainshock.

Exploring the Causal Relationship between Exposure to the 1994 Northridge Earthquake and Pre- and Post-Earthquake Preparedness Activities

2006 ◽  
Vol 22 (3) ◽  
pp. 569-587 ◽  
Author(s):  
Loc H. Nguyen ◽  
Haikang Shen ◽  
Daniel Ershoff ◽  
Abdelmonem A. Afifi ◽  
Linda B. Bourque
Keyword(s):  
Disaster Preparedness ◽  
Logistic Models ◽  
Population Based ◽  
Northridge Earthquake ◽  
Earthquake Epicenter ◽  
Financial Loss ◽  
Earthquake Preparedness ◽  
Before And After ◽  
Population Based Survey ◽  
1994 Northridge Earthquake

Whether, when, and why individuals prepare for disasters are major concerns of disaster preparedness researchers. Using population-based survey data collected after the 1994 Northridge earthquake, multinomial logistic models are imposed to examine if preparedness activities were adopted after the quake because of quake-related financial loss, physical and emotional injury, and proximity to the earthquake epicenter and shaking. The extent to which people invest in sustained preparedness was also examined by comparing the preparedness activities occurring both before and after the earthquake. The results indicated that exposure to physical, financial, and emotional injuries, and to shaking increased post-quake preparedness. Engaging in certain types of pre-quake preparedness increased the likelihood of post-quake preparedness. Post-quake preparedness is not affected by socioeconomic status or demographic factors, except that married persons are more likely to prepare in all situations and immigrants are more likely to adopt post-quake preparedness activities.

Design of steel MRF connections before and after 1994 Northridge earthquake

1998 ◽  
Vol 20 (12) ◽  
pp. 1030-1038 ◽  
Author(s):  
Egor Paul Popov ◽  
Tzong-Shuoh Yang ◽  
Shih-Po Chang
Keyword(s):  
Northridge Earthquake ◽  
Before And After ◽  
Steel Mrf ◽  
1994 Northridge Earthquake

Nonlinear ground-motion amplification by sediments during the 1994 Northridge earthquake

Nature ◽  
10.1038/37586 ◽  
1997 ◽  
Vol 390 (6660) ◽  
pp. 599-602 ◽  
Author(s):  
Edward H. Field ◽  
Paul A. Johnson ◽  
Igor A. Beresnev ◽  
Yuehua Zeng
Keyword(s):  
Ground Motion ◽  
Northridge Earthquake ◽  
Ground Motion Amplification ◽  
1994 Northridge Earthquake

The 1994 Northridge Earthquake Disaster Response: The Local Emergency Medical Services Agency Experience

1996 ◽  
Vol 11 (3) ◽  
pp. 172-179 ◽  
Author(s):  
Samuel J. Stratton ◽  
Virginia Price Hastings ◽  
Darlene Isbell ◽  
John Celentano ◽  
Miguel Ascarrunz ◽  
...  
Keyword(s):  
Public Health ◽  
Emergency Medical Services ◽  
Disaster Response ◽  
Communication Systems ◽  
Medical Services ◽  
Northridge Earthquake ◽  
Power Sources ◽  
Incident Command ◽  
Emergency Medical ◽  
1994 Northridge Earthquake

AbstractIntroduction:This paper describes the 1994 Northridge earthquake experience of the local emergency medical services (EMS) agency. Discussed are means that should improve future local agency disaster responses.Methods:Data reported are descriptive and were collected from multiple independent sources, and can be reviewed publicly and confirmed. Validated data collected during the disaster by the Local EMS Agency also are reported.Results:The experience of the Los Angeles County EMS Agency was similar to that of earthquake disasters previously reported. Communication systems, water, food, shelter, sanitation means, power sources, and medical supplies were resources needed early in the disaster. Urban Search and Rescue Teams and Disaster Medical Assistance Teams were important elements in the response to the Northridge earthquake. The acute phase of the disaster ended within 48 to 72 hours and public health then became the predominant health-care issue. Locating community food and water supplies near shelters, providing transportation to medical care, and public-health visits to shelter locations helped prevent the development of long-term park encampments. An incident command system for the field, hospitals, and government responders was necessary for an organized response to the disaster.Conclusion:Disaster preparedness, multiple forms of reliable communication, rapid mobilization of resources, and knowledge of available state and federal resources are necessary for a disaster response by a local EMS agency.

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