Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 24 February 1978:
Vol. 199. no. 4331, pp. 882 - 885
DOI: 10.1126/science.199.4331.882
Prev | Table of Contents | Next

Articles

Localized Compressional Velocity Decrease Precursory to the Kalapana, Hawaii, Earthquake

ARCH C. JOHNSTON 1

1 Cooperative Institute for Research in Environmental Sciences, University of Colorado/National Oceanic and Atmospheric Administration, Boulder 80309

A delay in the arrival times of compressional or P waves of 0.15 to 0.2 second from deep distant earthquakes has been detected at the closest seismograph station to the 20 November 1975 earthquake at Kalapana, Hawaii (surface-wave magnitude MS = 7.2). This delay appeared approximately 3.5 years prior to the quake, and travel times returned to normal several months before it. The P-wave arrival times at other nearby stations remained constant during this period, an indication that the decreased velocity implied by the delay in travel time was associated with this normal-faulting earthquake and was confined to distances less than 20 kilometers from the epicenter.

Submitted on July 11, 1977
Revised on October 31, 1977


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Seismicity associated with a cluster of earthquakes of mb greater double equals 4.5 near Adak, Alaska: Evidence for an asperity?.
J. R. BOWMAN and C. KISSLINGER (1985)
Bulletin of the Seismological Society of America 75, 223-236
   Abstract »    PDF »
Focal mechanisms of earthquakes related to the 29 November 1975 Kalapana, Hawaii, earthquake: The effect of structure models.
R. S. CROSSON and E. T. ENDO (1981)
Bulletin of the Seismological Society of America 71, 713-729
   Abstract »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)