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Björn Lund, Ph.D. student
E-mail: bl@geofys.uu.se
Zaher Hossein Shomali, Ph.D. student
E-mail: hs@geofys.uu.se
Ari Tryggvason, Ph.D. student
E-mail: at@geofys.uu.se
All at Department of Geophysics
Uppsala University
Reynir Bödvarsson was 40% funded by EC and Ragnar Slunga 20%.
The SIL microearthquake system produces detailed results of automatic analysis of large number of microearthquakes. To be able to work efficiently with this kind of information a special interactive program had previously been created. During the PRENLAB project, this software has been developed further and now accepts the results from single event location, multievent location, fault plane solutions and from rock stress tensor inversion as input. The program can be used for steering results from one analysis to another, for example the relative locations can give constraints on the fault plane orientation which can be used in the input for both fault plane solutions and rock stress tensor inversion. The development of this interactive software has also required modifications in all other software to facilitate the information flow between the different algorithms. In addition to what is written below, the UUPP.DGEO research group has been involved in further development of the SIL data acquisition system ranging from further development of the phase detector at the sites to the on-line multistation analysis and the multievent analysis. A new approach is being taken regarding the automatic operation of the network based on the positive results of the correlation techniques used in the relative location algorithm. Work has been initiated within the PRENLAB project to develop software for using cross-correlation of neighboring events to automatically determine the onsets of P- and S-phases with accuracy comparable to or better than achieved in the interactive analysis. The aim is to reduce the need for manual inspection of seismograms from local and regional earthquakes and to improve the quality of the readings in the microearthquake database []. This work is done in cooperation with the research group at IMOR.DG.