HR: 13:40h
AN: S53C-01    [Abstracts]
TI: An application of Relative Moment Tensor Inversion for Earthquake clusters in Northern Iceland recorded by SIL network
AU: * Hagos, L Z
EM: lijam.hagos@geo.uu.se
AF: Department of Earth Sciences, Uppsala University, Villavagen 16, Uppsala, 752 36 Sweden
AU: Shomali, H
S53C-01 AF: Department of Earth Sciences, Uppsala University, Villavagen 16, Uppsala, 752 36 Sweden
AU: Shomali, H
S53C-01 AF: Geological Survey of Sweden, Villavagen 18, Uppsala, 751 28 Sweden
AU: Roberts, R
S53C-01 AF: Department of Earth Sciences, Uppsala University, Villavagen 16, Uppsala, 752 36 Sweden
AU: Slunga, R
S53C-01 AF: Department of Earth Sciences, Uppsala University, Villavagen 16, Uppsala, 752 36 Sweden
AU: Lund, B
S53C-01 AF: Department of Earth Sciences, Uppsala University, Villavagen 16, Uppsala, 752 36 Sweden
AU: Bodvarsson, R
S53C-01 AF: Department of Earth Sciences, Uppsala University, Villavagen 16, Uppsala, 752 36 Sweden
AB: Abstract: We apply the method of Relative Moment Tensor Inversion (RMTI) to determine the focal mechanisms of clusters of earthquakes that occurred in the Tj”rnes fracture zone, in northern Iceland. Two distinct groups of spatially clustered events are observed in the region for a given time period. Our analysis was carried out using the relative moment tensor inversion on these events that were previously relocated based on cross-correlation techniques. The SIL network uses a spectral amplitude method to routinely calculate focal mechanism solutions (with a double-couple constraint) for every event occurred in the region. We use the RMTI method to determine the solutions and compared our results with solutions obtained by SIL network. We consider cases: a) with a double couple constraint and b) non-double couple (full moment tensor inversion), in order to examine the significance of the non-double parts (Isotropic and CLVD). Inversions are carried out by taking a well constrained master event for both clusters of earthquakes. Results have also been checked by removing this constraint and performing the inversion without considering a reference event. The SIL network provides amplitude and polarity information of earthquakes which makes the application fairly straight forward, allowing the development of an interface that enables to conduct a routine RMTI to SIL data.
DE: 7215 Earthquake source observations (1240)
SC: Seismology [S]
MN: Fall Meeting 2005