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High-frequency spectral scaling of a main shock/ aftershock sequence near the Norwegian coast

DIVISION 9111 SANDIA NATIONAL LABORATORIES, ALBUQUERQUE, NEW MEXICO 87185

Abstract

A high-frequency seismic element was recently added to the NORESS regional array in Norway. This system can monitor seismic signals at frequencies up to 50 Hz. In February 1986, the high-frequency seismic element recorded an m_bLg 4.7 main shock and several aftershocks which occurred 420 km northwest of NORESS, off Norway's western coast. These events produced high-frequency signals which were well above the background noise at the station. P-wave spectra of these events scale in a manner consistent with the -square, constant-stress-drop source model. The data do not require any change in this scaling to magnitudes (m_bLg) below 2, in contrast to previous reports that constant-stress-drop scaling breaks down at smaller magnitudes.

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