Earthquake Swarm Activity Beneath the Tokaanu-Waihi Geothermal System, Lake Taupo, New Zealand
The hypocenters of 4 earthquake swarms (total of 54 events), recorded with a local network between 1986 April and 1987 January, occur within upper crustal rocks of the deeper Tokaanu-Waihi geothermal reservoir; all the events had a magnitude M{sub L} {le} 3.2. Most foci are aligned along two NW-trending basement fault structures along which young rhyodacitic extrusions can be found. The swarm activity has been interpreted in terms of injections into basement fractures of magma from deeper chambers (dyke injection swarm activity).
- Research Organization:
- Geothermal Institute and Geology Department, University of Auckland, NZ, IGNS, Wairakei, NZ
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 895933
- Report Number(s):
- GEO-PROC-95-02; TRN: US200703%%752
- Country of Publication:
- United States
- Language:
- English
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