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Subcrustal earthquakes in the central South Island, New Zealand, and the root of the Southern Alps
Martin Reyners
Subcrustal earthquakes in the central South Island, New Zealand, and the root of the Southern Alps
Geology (Boulder) (December 1987) 15 (12): 1168-1171
Subcrustal earthquakes in the central South Island, New Zealand, and the root of the Southern Alps
Geology (Boulder) (December 1987) 15 (12): 1168-1171
Index Terms/Descriptors
Latitude & Longitude
Abstract
The Pukaki microearthquake network has revealed significant earthquake activity deeper than 15 km in the central South Island, New Zealand, extending to a depth of 73 km beneath the crest of the Southern Alps. Events deeper than 25 km define a planar seismic zone that has a strike of 41 degrees and dips northwest at 19 degrees . Gravity models suggest that earthquakes in this zone are occurring in a seismogenic uppermost mantle underlying an aseismic lower crustal root to the Southern Alps. The 17 degrees difference in strike of the dippng seismic zone and the Alpine fault provides an explanation for the pattern of uplift and crustal thickening seen in the central South Island.
ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 15
Serial Issue: 12
Title: Subcrustal earthquakes in the central South Island, New Zealand, and the root of the Southern Alps
Author(s): Reyners, Martin
Affiliation: DSIR, Geophys. Div.,
Wellington,
New Zealand
Pages: 1168-1171
Published: 198712
Text Language: English
Publisher: Geological Society of America (GSA),
Boulder, CO,
United States
References: 21
Accession Number: 1988-000020
Categories: SeismologySolid-earth geophysicsStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch maps
S47°30'00" - S40°30'00", E166°30'00" - E174°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by Institute of Geological and Nuclear Sciences Limited (GNS Science), Lower Hutt, New Zealand
Update Code: 1988
