[SSS17-P09] Searching significant displacement zone of Orkney earthquake fault by forward and inversion analysis with strain data observed at very close distance
Keywords:South Africa, induced earth quake, inversion
These strainmeters were apart each other about 150 m only. However, their strain changes had different polarities while the other M4 strain changes with a similar hypocentral distance was the same. So, this information can constrain the location and configuration of the M5.5 fault critically.
First, we conducted a forward analysis by assuming a point source with the mechanism same as macroscopic one of the M5.5 faultingat a distance of a few km. However, no difference in polarity in strain change was seen, suggesting that the effect of a finite size of the source with an edge much nearer than the point source had to be taken into account. We are attempting to invert the slip distribution on a source with a finite size together with surface strong motion data. We will report on the results at the meeting.