Ground-coupled air waves and diffracted infrasound from the Arequipa earthquake of June 23, 2001

Details Ground-coupled air waves and diffracted infrasound from the Arequipa earthquake of June 23, 2001 Ground-coupled air waves and diffracted infrasound from the Arequipa earthquake of June 23, 2001

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29r..33l&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 18, pp. 33-1, CiteID 1886, DOI 10.1029/2002GL015052

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13

Exploration Geophysics: Computational Methods, Potential Fields, Seismology: Earthquake Dynamics And Mechanics, Seismology: Earthquake Parameters, Meteorology And Atmospheric Dynamics: Stratosphere/Troposphere Interactions

Scientific paper

On June 23, 2001, a strong earthquake measuring Mw 8.4 occurred along the coast of south-central Peru. Coherent infrasonic waves were detected over a period of one hour by the IS08 infrasound station in Bolivia. Analysis of the ground-coupled air waves shows that the rupture propagated from the northwestern to the southeastern part of the fault with a rupture velocity of 3.3 km/s. The azimuth variation of the infrasonic waves is attributed to a distribution of secondary sources along the highest mountain ranges, which excite infrasonic waves that are diffracted to the ground. The predominant source of infrasound is likely distributed along the Andean Cordillera. Using the azimuth and arrival time determination, the horizontal scale size of the distant source regions of infrasonic waves is reconstructed over distances greater than 400 km.

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