A Caltech Library Service

Seismological research issues in the San Diego region

Heaton, Thomas H. and Jones, Lucile M. (1989) Seismological research issues in the San Diego region. In: Proceedings, Workshop on "the Seismic Risk in the San Diego Region: Special Focus on the Rose Canyon Fault System" : June 29-30, 1989, Reuben H. Fleet Space Theater, Grayson Boehm Lecture Hall, Balboa Park, San Diego, California. Southern California Earthquake Preparedness Project , Los Angeles, CA, pp. 42-49.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


What is the nature of earthquake ground motions that can be expected in San Diego's foreseeable future? Although this is the most basic of questions underlying the adequate design of structures to resist earthquakes, answers to this question are disturbingly uncertain. A reasonable assumption is that future earthquake ground motions will be similar to those that have occurred in the past. When compared with San Francisco or Los Angeles, San Diego has historically experienced relatively mild earthquake shaking. Unfortunately, San Diego's written history is very short compared to the time scales of earthquake repetition. Are there sources of earthquakes that may cause damage in San Diego and what is their frequency? Mapping of geologic structures and the study of patterns of small earthquakes are the primary tools for recognizing potentially active faults. There are features in both the geologic structure and the seismicity that are suggestive of major active faults that could pose a serious hazard to San Diego. Furthermore, there is evidence that the rate of occurrence of small earthquakes has increased within the last 5 years when compared with the previous 50 years. However, these features are not well studied or understood. Even if the potential sources of earthquakes were well understood, the problem of anticipating the range of future ground motions is difficult. The nature of shaking from earthquakes is strongly affected by the nature of seismic wave propagation through complex geologic structures (path effects). Although path effects are likely to be of great importance in San Diego, relatively little specific information is available.

Item Type:Book Section
Heaton, Thomas H.0000-0003-3363-2197
Jones, Lucile M.0000-0002-2690-3051
Additional Information:© 1989 Southern California Earthquake Preparedness Project.
Record Number:CaltechAUTHORS:20121127-134135015
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35677
Deposited By: Tony Diaz
Deposited On:04 Jan 2013 23:13
Last Modified:01 Nov 2022 23:42

Repository Staff Only: item control page