| Title | Analysis of seismological data on Reykjanes peninsula, Icelan |
|---|---|
| Authors | Blanck, H; Jousset, P; Hersir, G P; Ágústsson, K; Flóvenz, O G |
| Year | 2016 |
| Conference | European Geothermal Congress |
| Keywords | IMAGE, seismicity, Reykjanes, Iceland, Vp/Vs |
| Abstract | From the spring of 2014 until late 2015 a dense seismic network was recording on Reykjanes Peninsula in southwest Iceland. Additionally to the existing long-term and permanent networks, we deployed a temporary network consisting of 30 on-land stations and 24 Ocean Bottom Seismometers (OBS). The data of the on-land stations were collected every 70 days and the OBSs were read out after recovery. The SeisComp software was used to pick and locate 2066 earthquakes along the mid ocean ridge and within the geothermal system. Earthquakes associated with the geothermal area are very shallow (<2 km) while events along the spreading axis are 4 – 6 km deep on-land and deepening with increased distance from the shore. Furthermore, we see that a cluster of about 200 events which is induced by the drilling on Reykjanes and onset of operation of a local injection borehole. The picked data were used for a Vp/Vs ratio analysis which is an important proxy of porosity, temperature in the subsurface and indicates if partial melt is present. It was calculated to be 1.766 which is consistent with earlier studies of the area. Furthermore, the data can be used as input for various other methods such as travel time, attenuation and ambient noise tomography or interferometry. |