A baseline microearthquake survey of the Mokai geothermal field

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Sherburn, S. 1986 A baseline microearthquake survey of the Mokai geothermal field. [s.l.]: [s.n.]. Report / Geophysics Division 209 16 p.

Abstract: A 23 microearthquake survey of the Mokai Geothermal Field to determine the background level of seismicity to field development observed very low levels of microearthquake activity. Although nine microearthquakes, with magnitudes (M) between 0.9 and 3.2, were located during this survey none occurred within the field, though two were close to the field boundary. About 35 very local microearthquakes, with magnitudes between 0.2 and 1.1, were recorded on seismographs within or very close to the field; these could not be located, but six of these may have originated from within the field. Earthquakes of M > 3.0 location by the national seismograph network, that occurred in the Mokai area between 1965 and mid-1983, were also not grouped close to the field. As with other geothermal fields in the Taupo Volcanic Zone, Mokai does not exhibit a level of seismicity greater than the surrounding area. (auth)