Some results of tectonomagnetic monitoring in the epicentral zone of the M7.5 Altay earthquake, September 27, 2003

摘要

We report tectonomagnetic results from the epicentral area of the 27 September 2003 Ms=7.5 earthquake in theAltay mountains, southern West Siberia. The results were obtained in the first three survey campaigns in earlyOctober 2003, late November 2003, and latest May-early June 2004 using an array of one continuous-measurementstation and fifteen repeated-survey sites. Changes in total geomagnetic field associated with seismic activitywere mostly of regional scale and usually did not exceed 1.5 nT. The M=4.5 aftershock of 31 May 2004 wasaccompanied by an anomaly of 1-2 nT. The location of the anomaly within highly magnetic rocks can be evidenceof its piezomagnetic origin.