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- W2039251131 abstract "Estimates of moments, source dimensions and stress drops were made for 34 shallow-focus earthquakes in the Tonga arc between 1963 and 1969. Moments were determined from mantle wave spectra and from long period P and S wave spectra. Source dimensions were estimated from the corner frequency of the P and S wave spectra using Brune's (1970) theory. From the moment and the source dimension, the stress drop was approximately determined. Source dimensions and the stress drops increase with moment, and stress drops are typically between a few bars and a few tens of bars for earthquakes with body wave magnitudes of about 512 to 7. In addition, the data suggest regional variations in stress drops. The earthquakes with relatively large stress drops did not occur along the main underthrusting zone of the arc that defines the boundary between the Pacific and Australian plates. These earthquakes, instead, reflect deformation within one plate of lithosphere, and not movement along pre-existing faults that separate two distinct plates. Thus, some of these earthquakes may result from the creation of new faults. High stresses might be expected for such earthquakes because of the high strength of unfaulted rock." @default.
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- W2039251131 date "1972-01-01" @default.
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- W2039251131 title "Moments, source dimensions and stress drops of shallow-focus earthquakes in the Tonga-Kermadec arc" @default.
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- W2039251131 doi "https://doi.org/10.1016/0031-9201(72)90010-6" @default.
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