A Portable Refraction Seismograph Prs1

Asudeh, I.; Anderson, F D; Parmelee, J. A.; Vishnubhatla, S. S.; Munro, P S; Thomas, Jerome B.

doi:10.4095/133234

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The REFTEKs are described by PASSCAL (1991) and Brocher et al (1999) The Portable Refraction Seismographs (PRS-1s and PRS-4s) used during Dry SHIPS have been described by Asudeh et al (1992Asudeh et al ( , 1998 and Luetgert et al (1993). A single component from a Mark Products® L4A 2-Hz vertical component geophone was recorded.…”

Section: Seismographsmentioning

confidence: 99%

Report for explosion and earthquake data acquired in the 1999 Seismic Hazards Investigation of Puget Sound (SHIPS), Washington

Brocher¹,

Pratt²,

Miller³

et al. 2000

Open-File Report

View full text Add to dashboard Cite

This report describes the acquisition, processing, and quality of seismic reflection and refraction data obtained in the Seattle basin, central Puget Lowland, western Washington, in September during the Seismic Hazards Investigation of Puget Sound (SHIPS). As a sequel to the 1998 SHIPS air gun experiment (also known as "Wet SHIPS"), the 1999 experiment, nicknamed "Dry SHIPS", acquired a 112-km-long east-west trending multichannel seismicreflection and refraction line in the Seattle basin. One thousand and eight seismographs were deployed at a nominal spacing of 100 meters and 29 shot points were detonated at approximately 4 km intervals along the seismic line. The wide-angle seismic profile was designed to (1) determine the E-W geometry of Seattle basin, (2) measure the seismic velocities within the basin, and (3) define the basement structure underlying the Seattle basin. In this report, we describe the acquisition of these data, discuss the processing and merging of the data into common shot gathers, and illustrate the acquired profiles. We also describe the format and content of the archival tapes containing the SEGY-formatted, common-shot gathers. Data quality is variable but useful data were acquired from all 29 shot points fired along the Dry SHIPS seismic line. The data show pronounced travel time delays associated with the low velocity sedimentary rocks filling the Seattle basin. Thirty-five REFTEK stations, deployed at 4 km intervals along the Dry SHIPS line, recorded 26 regional earthquakes and blasts and 17 teleseismic events, including the main shock and several aftershocks of the M w = 7.6 Chi-Chi (Taiwan) earthquake of 9/20/1999. The teleseismic recordings of the Chi-Chi (Taiwan) mainshock provide useful signals down to 10 second periods. They document a significant (factor between 5 and 10) focusing of compressional-and shear-wave energy by the Seattle basin at periods between 1 and 2 seconds relative to "bedrock" sites east and west of the basin. Signal durations in the Seattle basin were also substantially increased relative to "bedrock" sites in the Olympic peninsula and Cascade foothills.

show abstract

Section: Seismographsmentioning

confidence: 99%

Report for explosion and earthquake data acquired in the 1999 Seismic Hazards Investigation of Puget Sound (SHIPS), Washington

Brocher¹,

Pratt²,

Miller³

et al. 2000

Open-File Report

View full text Add to dashboard Cite

show abstract

Report for borehole explosion data acquired in the 1999 Los Angeles Region Seismic Experiment (LARSE II), Southern California: Part I, description of the survey

Fuis¹,

Murphy²,

Okaya³

et al. 2001

Open-File Report

View full text Add to dashboard Cite

APPENDICES (2) 1994 recording of airgun signals on a 4.2-km-long seismic streamer towed by the R.V. Ewing along the offshore parts of Lines 1, 2, and 3 (Brocher and others, 1995) (3) 1994 recording of airgun signals on ocean-bottom seismographs along the offshore parts of Lines 1 and 2 (ten Brink and others, 1996) (4) 1994 onshore recording of the airgun signals along Lines 1, 2, and 3 (Okaya and others, 1996a) (5) 1994 onshore recording of earthquakes along Lines 1, 2, and 3 (8-day period) (Okaya and others, 1996b). (6) 1994 recording of borehole explosions along Line 1 (Murphy and others, 1996) (7) 1997 recording of local and distant earthquakes along Line 1 in the Los Angeles basin (9-month period) (Kohler and others, 2000) (8) 1998-1999 recording of local and distant earthquakes along Line 2 (6.5-month period) (Kohler and Kerr, in preparation) A variety of seismic instrumentation was used in these imaging surveys and was obtained from collaborators from around the world, including the Geological Survey of Canada (

show abstract

A Portable Refraction Seismograph Prs1

Cited by 2 publications

References 0 publications

Report for explosion and earthquake data acquired in the 1999 Seismic Hazards Investigation of Puget Sound (SHIPS), Washington

Report for explosion and earthquake data acquired in the 1999 Seismic Hazards Investigation of Puget Sound (SHIPS), Washington

Report for borehole explosion data acquired in the 1999 Los Angeles Region Seismic Experiment (LARSE II), Southern California: Part I, description of the survey

Contact Info

Product

Resources

About