Localized Compressional Velocity Decrease Precursory to the Kalapana, Hawaii, Earthquake
- 24 February 1978
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 199 (4331) , 882-885
- https://doi.org/10.1126/science.199.4331.882
Abstract
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.Keywords
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