Community Research and Development Information Service - CORDIS

Abstract

Seismograms from local earthquakes recorded on Milos have been analysed for shear wave splitting diagnostic of seismic anisotropy. Complex P and shear wavetrains indicated the presence of much heterogeneity, but shear wave splitting was identified in most shear wave arrivals within the shear wave window. The polarisations of the leading shear waves show alignments which in general are consistent at each station and at groups of stations, suggesting the presence of vertical cracks aligned approximately north-south along the propagation paths. This suggests that the local maximum compressional stress is also north-south. This crack distribution probably exists within 5km of the surface, since the earthquake mechanisms (at focal depths from 5 to 11km) do not appear to be controlled by a north-south stress.

Additional information

Authors: BOOTH D C, BRITISH GEOLOGICAL SURVEY, EDINBURGH (UK);SCHLEPER S, BRITISH GEOLOGICAL SURVEY, EDINBURGH (UK);CRAMPIN S, BRITISH GEOLOGICAL SURVEY, EDINBURGH (UK);OCHMANN N, BRITISH GEOLOGICAL SURVEY, EDINBURGH (UK);WOHLENBERG J BRITISH GEOLOGICAL SURVEY, EDINBURGH (UK), BRITISH GEOLOGICAL SURVEY, EDINBURGH (UK)
Bibliographic Reference: EUR 12131 EN (1990), 43 PP., MF, ECU 4, AVAILABLE FROM THE OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
Availability: Can be ordered online
Record Number: 1989128022200 / Last updated on: 1990-11-09
Category: PUBLICATION
Available languages: en
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top