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Microseismic feasibility study: detection of small magnitude events (Ml<0.0) for mapping active faults in the Betic Cordillera (Spain)

By Manfred Joswig and Martin Häge

Abstract

We present the results of the first application of the newly developed concept «Nanoseismic Monitoring» on active<br />faults in the region close to Murcia, Spain. The aim of this microseismic feasibility study is to test if it is possible<br />to record small magnitude events (ML<0.0) within a short period of time with surface installations and to investigate<br />if these events are related to the regional catalog in terms of amount of events. The seismic monitoring<br />was performed with one small array called the Seismic Navigating System. It consists of one central three component<br />and three one component seismometers arranged tripartitely around the central station. In the measurement<br />period of two nights at two different sites we were able to detect 19 microearthquakes down to ML = -2.6. The results<br />correlate well with the frequency-magnitude distribution of the regional bulletin. This in turn will allow for<br />estimation of monitoring rates before actual field measurements just from bulletin data. Given an activity rate of<br />5 to 10 events per night one may map active fault zones within just a few weeks of field campaign

Topics: Betic Cordillera – active faults – microseismicity – Gutenberg-Richer law – Nanoseismic Monitoring, Geophysics. Cosmic physics, QC801-809, Physics, QC1-999, Science, Q, DOAJ:Geophysics and Geomagnetism, DOAJ:Earth and Environmental Sciences, Meteorology. Climatology, QC851-999
Publisher: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Year: 2009
DOI identifier: 10.4401/ag-4635
OAI identifier: oai:doaj.org/article:9312e19592d746b08c33bd6f388c99a1
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