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In 1999 the Earth was shaking with a moment magnitude of 4.9 in Bormio (I) and in 2005 an earthquake with a moment magnitude of 4.5 occurred in Vallorcine (F). These two significant earthquakes at the boarder of Switzerland caused a number of aftershocks in the according regions. We tried to find a positive correlation between the occurrence of those aftershocks and zones in the immediate surrounding of the mainshock epicentres where the stress increased by equal or more thab 0.5 bar.
We expected that most of aftershocks occur in regions where stress has increased. Such a positive correlation was shown before, for example in the paper of King et al. (1994). What we actually found was that the majority of the aftershocks occurred in regions where the stress has dropped by an amount of 0.5 bar or more.We assume, because most of the studies (King et al., 1994; Stein et al., 1992; Harris, 1998; Wan et al., 2000) could show a positive correlation between the ocurrence of aftershocks and increased stress, it is likely that our approach fails for the following reasons. We could show that these deviation from other studies is probably caused by the fact of large uncertainties concerning the fault geometry and the fact that the moment magnitudes were too small to generate significant stress patterns.
In this term paper i collect information from different papaer to obtain a picture of the recent research concerning this topic.
The Yellowstone area in the United States are very interesting. In this paper I try to summarize the most interseting points.
This term paper is about core anisotropy and differential roatation. You can download here and see also an abstract.
