Assessment of SeisComP3 automatic moment tensor solutions

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Ristau, J. 2016 Assessment of SeisComP3 automatic moment tensor solutions. Lower Hutt, N.Z.: GNS Science. GNS Science report 2016/44 iii, 22 p. doi:10.21420/G20597

Abstract: 37 earthquakes with moment tensor solutions calculated using the SeisComP3 (SC3) automatic moment tensor module are compared with moment tensor solutions calculated manually using the method currently used by GeoNet. The earthquakes have a wide range of locations, moment magnitude (Mw 4.6–6.6) and depth (2–204 km). The similarity of the focal mechanisms are compared by calculating the principal axis angle ε0, which is the smallest angle needed to rotate one set of principal axes to correspond with the second set. The automatic moment tensor module is capable of producing solutions which compare very well with manually calculated solutions; however, it also produces automatic solutions significantly different from the manual solutions. There is no obvious correlation between location/Mw/depth, and the similarity of the automatic and manual moment tensor solutions. Further testing of the automatic moment tensor module is required before it can be trusted to produce reliable moment tensor solutions. (auth)