Surface-Wave Amplitude-Versus-Distance Relation in the Western United States

reportActive / Technical Report | Accession Number: AD0870769 | Open PDF

Abstract:

For epicentral distances less than 15 degrees in the Western United States, a new correction factor is proposed for use in the common Gutenberg formulation for surface-wave magnitude. The data on which this is based are 684 Rayleigh-wave amplitudes from Nevada Test Site explosions measured visually on the records of LRSM mobile stations and VELA observatories. The need for the variable T period in the magnitude calculation is discounted on empirical evidence. Magnitudes at distances less than 15 degrees when recomputed using the new correction factor are in excellent agreement with teleseismic magnitudes and show less scatter among themselves than previously. An estimate of the effective QR in the crust from the data is about 130. Amplitude losses should reflect other causes than anelasticity, and this value is undoubtedly much lower than the real QR.

Author(s):
Von Seggern, D. H.
Author Organization(s):
TELEDYNE INDUSTRIES INC ALEXANDRIA VA EARTH SCIENCES DIV
Descriptive Note:
Seismic data lab. rept.
Pagination:
0053

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
SDL-249
Contract/Grant Number(s):
F33657-69-C-0913, ARPA ORDER-624
Project Number(s):
VT/9706
Monitor Series:
DARPA
 Subject Terms
Joint Capability Areas:
JCA_8_Building Partnerships; JCA_3_Force Application; JCA_4.5.4_Requirements Definition; JCA_4.5_Operational Contract Support; JCA_8.2_Shape; JCA_3.2_Engagement; JCA_3.2.1_Kinetic Means; JCA_1_Force Support; JCA_1.3_Human Capital Management; JCA_5.3_Planning; JCA_5_Command and Control; JCA_1.3.2_Personnel Management; JCA_8.1_Communicate; JCA_6.3.3_Spectrum Management
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*SEISMOLOGICAL STATIONS, *UNDERGROUND EXPLOSIONS, COLORADO, CORRECTIONS, DETECTION, EARTHQUAKES, EPICENTERS, INTENSITY, MATHEMATICAL ANALYSIS, MOBILE, NEVADA, NEW MEXICO, NOISE, NUCLEAR EXPLOSIONS, RAYLEIGH WAVES, SEISMOMETERS, SIMULATION, SITE SELECTION, SURFACE PROPERTIES
Field(s)/Group(s):
Seismology, Seismic Detection and Detectors
Keyword(s):
GASBUGGY SHOT, RULISON SHOT, *SDM(SEISMIC DATA LABORATORIES), *SEISMIC DATA LABORATORIES, VELA UNIFORM
Report Date:
1970 Jan 14