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Anomalous Acoustic Signals Recorded by the CERI Seismic Network

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	INTRODUCTION

 
Previous studies have shown a variety of atmospheric disturbances (e.g., sonic booms, meteoroid falls, thunder, and explosions) can be detected by a seismograph if the acoustic pressure wave energy is sufficiently strong. Kanamori et al. (1991) and Cates and Sturtevant (2002) used the seismic network in southern California to study sonic booms generated by the space shuttle and aircraft. Ishihara et al. (2003) used seismic data from a dense seismographic array in the northeastern region of Honshu Island, Japan, to determine the trajectory of a meteoroid. Kappus and Vernon (1991) analyzed the acoustic signature of thunder from a seismic instrument located at Kislovodsk, USSR.

Atmospheric shock waves generated by sonic booms, meteoroid falls, and explosions have been observed in the Center for Earthquake Research and Information (CERI) Cooperative Seismic Network (Johnston 1987; Langston 2004). On 28 January 2004 at 01:58 UTC, 11 short-period and nine broadband CERI network stations (figure 1) recorded high signal-to-noise ratio signals generated by an unknown source (figure 2). A preliminary analysis of the waveforms and slow velocity across the network suggested that these signals were not generated by an earthquake but by an acoustic source. CERI also received several calls from the public in southern Missouri reporting large booming noises around the time when the event was recorded by the CERI network (G. Patterson, personal communication, 2005). One of these reports was from a medical worker in a two-story building in Poplar Bluff, Missouri. She reported that everyone on the second floor felt a hard jarring shake and heard a loud explosion, but few felt it on the first floor. The seismic signals have durations of 30 to 70 s with distinct later arrivals. For example, . . . [Full Text of this Article]

Center for Earthquake Research and Information
University of Memphis
Memphis, Tennessee 38152
mulas62@yahoo.com
(T.-L.L.)
clangstn@memphis.edu
(C.A.L.)

This article has been cited by other articles:

				J. Pujol and P. Rydelek A Reanalysis of Anomalous Acoustic Signals Recorded by the CERI Seismic Network on 28 January 2004 Seismological Research Letters, May 1, 2007; 78(3): 389 - 393. [Full Text] [PDF]