Depth dependence of earthquake foci in relation to structure and physical 
properties of the lithosphere

Bormann, P.; Bankwitz, P.; Grünthal, Gottfried; Neunhöfer, H.; Schulz, A.

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Depth dependence of earthquake foci in relation to structure and physical properties of the lithosphere

Authors

Bormann, P.
External Organizations;

Bankwitz, P.
External Organizations;

/persons/resource/ggrue

Grünthal, Gottfried
2.6 Seismic Hazard and Stress Field, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Neunhöfer, H.
External Organizations;

Schulz, A.
External Organizations;

External Ressource

No external resources are shared

Fulltext (public)

There are no public fulltexts stored in GFZpublic

Supplementary Material (public)

There is no public supplementary material available

Citation

Bormann, P., Bankwitz, P., Grünthal, G., Neunhöfer, H., Schulz, A. (1986): Depth dependence of earthquake foci in relation to structure and physical properties of the lithosphere. - Gerlands Beiträge zur Geophysik, 95, 5, 371-380.

https://gfzpublic.gfz-potsdam.de/pubman/item/item_232400

Abstract

In recent years more and more data has become available about focal depth of intra-crustal earthquakes as well as structure and distribution of physical and geologic-petrological parameters as a function of depth. This allows us to study the causes for increased earthquake occurrence at certain depth intervals. Besides structural and material inhomogeneities this is mainly controlled by depth and temperature-dependent variations of rheological properties of crustal materials. Intra-crustal earthquakes occur in an intraplate environment almost exclusively in the depth-range 2km < h < 20km with a clear maximum of activity between some 5 to 15km. The petrophysical as well as possible geologic-petrological reasons are discussed. The brittle fracture behaviour of crustal material is strongly controlled by the v"SUB p"/v"SUB s"-ratio. In crustal regions with v"SUB p"/v"SUB s" = or > 1.8 there is obviously no seismic activity. -from Authors