A double Benioff zone beneath the central Aleutians - An unbending of the lithosphere

Details A double Benioff zone beneath the central Aleutians - An unbending of the lithosphere A double Benioff zone beneath the central Aleutians - An unbending of the lithosphere

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977georl...4..473e&link_type=abstract

Geophysical Research Letters, vol. 4, Oct. 1977, p. 473-476. U.S. Geological Survey

Computer Science

Sound

27

Aleutian Islands (Us), Crustal Fractures, Earthquakes, Lithosphere, Seismology, Sound Waves, Analog Simulation, Dynamic Models, Dynamic Response, Fourier Transformation, Noise Spectra, Seismograms, Signal Processing, Stress Analysis, Stress-Strain Relationships

Scientific paper

Seismicity located using the Adak seismograph network shows the Benioff zone below a depth of 100 km consists of two thin zones of earthquakes about 25 km apart that merge at a depth of 175 km. Focal mechanisms in the upper zone are consistently down-dip compression, while those of the lower zone are down-dip tension. An elastic-plastic model of the lithosphere predicts that these two zones reflect the stresses in the elastic core of the lithosphere due to unbending.

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