Greinar (Vísindafélag Íslendinga) - 01.01.1976, Qupperneq 51

Greinar (Vísindafélag Íslendinga) - 01.01.1976, Qupperneq 51
49 able. To avoid errors caused by statíon residuals and lateral inho- mogeneitíes along the rays it is important to use always the same station set for the locations. To assure a consistent picking of the P-wave arrival the wave trains of all events as recorded at one station were correlated visu- ally with the P-wave train of the master event. A corresponding arrival was then picked for all events. This procedure was found to improve significantly the quality of the locations. Inherent in this method are the assumptions that all events occurred at approxi- mately the same depth and had similar focal mechanism. Earth- quakes on the Reykjanes Peninsula in SW Iceland occur mostly at depths of 2-5 km (10) and earthquakes in the Tjömes Fracture Zone can be expected to occur at similar depths. The assumption of similar focal mechanism hmits the applicability of this method. It is, for example, not safe at the present time to locate the earth- quake sequence of October 1973 with respect to the sequences of 1969, since a similar tectonic origin is not certain. In this paper earthquakes of 1968 and 1969 are studied. Of these earthquakes (No. 21-31 in Table 1) only one (No. 30) was too small for this analysis. The seismic stations used in this study were AKU, KTG, UME, NUR, BMO and UBO. All seismographs from the first four stations were read by the author but for the last two stations readings were taken from the EDR bulletin. The station AKU in Iceland (Figure 2) was used as a reference station and for a particular earthquake the arrival time at AKU was subtracted from the arrival times at the other stations. These travel time differences were then com- pared to the corresponding travel time differences for the master earthquake. We consider two stations, A and B. At these stations the travel times, tA and tB of the earthquake to be located can be expressed as tMA and tMB are the travel times for the master event to the sta- 4
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Greinar (Vísindafélag Íslendinga)

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