Eurasian Seismic Surveillance - 2D FD Seismic Synthetics and Event Discrimination

In addition to the paper included in the First Scientific Report submitted to AFOSR (19. May 1993) two other studies have been completed in the reporting period. The first of these (Tarvainen and Husebye, 1994) deals with spatial and temporal patterns in Fennoscandian seismicity essentially amountin...

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Bibliographic Details
Main Authors: Ruud, Bent O., Husebye, Eystein S.
Other Authors: OSLO UNIV (NORWAY)
Format: Text
Language:English
Published: 1993
Subjects:
Mining Engineering
Seismology
Explosions
Nuclear Weapons
*EXPLOSIONS
*SEISMIC DETECTION
*NUCLEAR EXPLOSION DETECTION
*SEISMIC DISCRIMINATION
*SEISMIC WAVES
*EARTHQUAKES
*MINES(EXCAVATIONS)
ALGORITHMS
COMPUTATIONS
MODELS
WAVE PROPAGATION
LITHOSPHERE
SCANNERS
SEISMOGRAPHS
TECTONICS
OCEANIC CRUST
OPTICAL SCANNING
SEISMIC VELOCITY
EARTH CRUST
CLASSIFICATION
SURFACES
TOPOGRAPHY
MONITORING
REAL TIME
TWO DIMENSIONAL
PE61102F
WUAFOSR2309AS
SEISMICITY
Ruud
Fennoscandian
Online Access:http://www.dtic.mil/docs/citations/ADA274967
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA274967
Description
Summary:In addition to the paper included in the First Scientific Report submitted to AFOSR (19. May 1993) two other studies have been completed in the reporting period. The first of these (Tarvainen and Husebye, 1994) deals with spatial and temporal patterns in Fennoscandian seismicity essentially amounting to an exercise in monitoring mining and other explosions. We demonstrate that there exist a very consistent diurnal/weekly and spatial patterns for the numerous explosion events included in local seismological bulletins. The other study (Hestholm and Ruud, 1994) presents a numerical 2D finite difference (FD) algorithm for including free surface topography in synthetic seismogram analysis. The realism of this method is demonstrated through displays of snapshots and synthetic seismograms of a shallow explosion for models without and with topography included. (continue on next page) Regarding ongoing research, most efforts have been devote to 2D FD synthetics for simulating seismic wave propagation in a complex lithosphere. In practice model set-up for FD computations have proved cumbersome so we are elaborating on automating structural model generation. The new approach is tied to using an optical scanner for reading a figure of multilayered crustal model. Seismic event classification, Real-time magnitude estimation, Crustal structure of Iberia, 2D FD synthetics including topography, Fennoscandian seismicity.

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