Composition of Short-Period Regional Phases Inferred From Fennoscandian Array Data

Short-period seismograms from local and regional events recorded at the NORESS and ARCESS arrays are being studied in order to understand the composition of local and regional phases and to separate the effects of structure and source parameters on the seismic signal. This is a precondition for accu...

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Bibliographic Details
Main Authors: Vogfjord, Kristin, Langston, Charles A., Yan, Ben
Other Authors: PENNSYLVANIA STATE UNIV UNIVERSITY PARK
Format: Text
Language:English
Published: 1991
Subjects:
Seismology
*SEISMIC WAVES
*EARTHQUAKES
*SEISMOLOGY
*SEISMIC ARRAYS
VELOCITY
PROPAGATION
EARTH MANTLE
MOHOROVICIC DISCONTINUITY
SEISMOGRAPHS
FINLAND
ARCTIC REGIONS
NORWAY
WAVE PROPAGATION
RECEIVERS
EARTH CRUST
SCANDINAVIA
P-WAVES
REGIONAL WAVE PROPAGATION
RECEIVER FUNCTIONS
F-K ANALYSIS
NORESS(NORWEGIAN EXPERIMENTAL SMALL SUBARRAY)
ARCESS(ARCTIC EXPERIMENTAL SMALL SUBARRAY)
MOHO
SBI1
FISCAL YEAR 92
FENNOSCANDIAN ARRAY
PE62101F
WUPL760009AQ
Arctic
Norway
Fennoscandian
Online Access:http://www.dtic.mil/docs/citations/ADA253289
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA253289
Description
Summary:Short-period seismograms from local and regional events recorded at the NORESS and ARCESS arrays are being studied in order to understand the composition of local and regional phases and to separate the effects of structure and source parameters on the seismic signal. This is a precondition for accurate phase identification and accordingly, for reliable location of events within regional distances. F-K analysis is used to identify and locate arrivals in the seismograms and a composite of array beams is used as an approximation to each event. Interferences about structure differences at ARCESS and NORESS are made by comparing composite-seismogram record sections from the two sites. Synthetic P-wave seismograms are calculated for velocity models representing the average structure of the propagation paths. The effects of near-receiver and source structure on regional phases need to be understood and separated from the effects of propagation path. For this purpose receiver functions obtained from teleseismic events, recorded at the three-component, intermediate-period channels, EO at NORESS and ARCESS are being analyzed. Average Moho depth of 35 km is obtained under NORESS by stacking receiver functions from all events. The effects of a surface scatterer at Lake Mjosa are seen in one event.

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