Infrasound from the El Paso super-bolide of October 9, 1997

ReVelle, D O; Whitaker, R W; Armstrong, W T

Title: Infrasound from the El Paso super-bolide of October 9, 1997

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Abstract

During the noon hour on October 9, 1997 an extremely bright fireball ({approx}-21.5 in stellar magnitude putting it into the class of a super-bolide) was observed over western Texas with visual sightings from as far away as Arizona to northern Mexico and even in northern New Mexico over 300 miles away. This event produced tremendously loud sonic boom reports in the El Paso area. It was also detected locally by 4 seismometers which are part of a network of 5 seismic stations operated by the University of Texas at El Paso (UTEP). Subsequent investigations of the data from the six infrasound arrays used by LANL (Los Alamos National Laboratory) and operated for the DOE (Department of Energy) as a part of the CTB (Comprehensive Test Ban) Research and Development program for the IMS (International Monitoring System) showed the presence of an infrasonic signal from the proper direction at the correct time for this super-bolide from two of the six arrays. Both the seismic and infrasound recordings indicated that an explosion occurred in the atmosphere at source heights from 28--30 km, having its epicenter slightly to the northeast of Horizon City, Texas. The signal characteristics, analyzed from {approx}0.1 to 5.0 Hz,more »« less

Authors:: ReVelle, D O; Whitaker, R W; Armstrong, W T

Publication Date:: Thu Dec 31 00:00:00 EST 1998

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE, Washington, DC (US)

OSTI Identifier:: 314136

Report Number(s):: LA-UR-98-2893; CONF-980731-
ON: DE99001767; TRN: US200304%%282

DOE Contract Number:: W-7405-ENG-36

Resource Type:: Conference

Resource Relation:: Conference: 43. international symposium on optical science, engineering, and instrumentation, San Diego, CA (US), 07/19/1998--07/24/1998; Other Information: Supercedes report DE99001767; PBD: [1998]; PBD: 31 Dec 1998

Country of Publication:: United States

Language:: English

Subject:: 98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION; AMPLITUDES; ARIZONA; EPICENTERS; EXPLOSIONS; MONITORING; NEW MEXICO; SATELLITES; TNT; US DOD; VELOCITY

Citation Formats


                    ReVelle, D O, Whitaker, R W, and Armstrong, W T. Infrasound from the El Paso super-bolide of October 9, 1997.  United States: N. p., 1998. 
        Web.

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                    ReVelle, D O, Whitaker, R W, & Armstrong, W T. Infrasound from the El Paso super-bolide of October 9, 1997.  United States.

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                    ReVelle, D O, Whitaker, R W, and Armstrong, W T. 1998.  
        "Infrasound from the El Paso super-bolide of October 9, 1997".  United States.  https://www.osti.gov/servlets/purl/314136.

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@article{osti_314136,

  title        = {Infrasound from the El Paso super-bolide of October 9, 1997},

  author       = {ReVelle, D O and Whitaker, R W and Armstrong, W T},

  abstractNote = {During the noon hour on October 9, 1997 an extremely bright fireball ({approx}-21.5 in stellar magnitude putting it into the class of a super-bolide) was observed over western Texas with visual sightings from as far away as Arizona to northern Mexico and even in northern New Mexico over 300 miles away. This event produced tremendously loud sonic boom reports in the El Paso area. It was also detected locally by 4 seismometers which are part of a network of 5 seismic stations operated by the University of Texas at El Paso (UTEP). Subsequent investigations of the data from the six infrasound arrays used by LANL (Los Alamos National Laboratory) and operated for the DOE (Department of Energy) as a part of the CTB (Comprehensive Test Ban) Research and Development program for the IMS (International Monitoring System) showed the presence of an infrasonic signal from the proper direction at the correct time for this super-bolide from two of the six arrays. Both the seismic and infrasound recordings indicated that an explosion occurred in the atmosphere at source heights from 28--30 km, having its epicenter slightly to the northeast of Horizon City, Texas. The signal characteristics, analyzed from {approx}0.1 to 5.0 Hz, include a total duration of {approx}4 min (at Los Alamos, LA) to >{approx}5 min at Lajitas, Texas, TXAR, another CTB IMS array operated by E. Herrin at Southern Methodist University (SMU) for a source directed from LA toward {approx}171--180 deg and from TXAR of {approx}321-4 deg respectively from true north. The observed signal trace velocities (for the part of the recording with the highest cross-correlation) at LA ranged from 300--360 m/sec with a signal velocity of 0.30 {+-} 0.03 km/sec, implying a Stratospheric (S Type) ducted path. The dominant signal frequency at LA was from 0.20 to 0.80 Hz, with a peak near 0.3 Hz. These highly correlated signals at LA had a very large, peak to peak, maximum amplitude of 21.0 microbars (2.1 Pa). The analysis, using several methods that incorporate various observed signal characteristics, total distance traveled, etc., indicates that the super-bolide probably had a source energy in the range between 10--100 tons (TNT equivalent). This is somewhat smaller than the source energy estimate made using US DoD satellite data (USAF news release, June 8, 1998).},

  doi          = {},

  url          = {https://www.osti.gov/biblio/314136},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Thu Dec 31 00:00:00 EST 1998},

  month        = {Thu Dec 31 00:00:00 EST 1998}

}

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