Comparison of the rupture and radiation characteristics of intermediate and deep earthquakes

Campus, P.; Das, S.

doi:10.1029/1999jb900384

Cited by 33 publications

(34 citation statements)

References 27 publications

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“…If we use V r = 0.6 V s (the average from Frohlich []) the stress drop will increased by a factor of 10, with a consequent reduction of the efficiency. Despite that, and assuming that k is constant as a function of moment, the observed scaling is robust, and it is in agreement with previous studies of deep and intermediate‐depth earthquakes [e.g., Campus and Das , ; Poli and Prieto , ]. We further neglect the directivity effect, which can be size‐dependent (e.g., unilateral rupture for big earthquakes), and thus playing a role on the observed scaling.…”

Section: Discussionsupporting

confidence: 89%

Global rupture parameters for deep and intermediate‐depth earthquakes

Poli

Prieto

2016

JGR Solid Earth

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We investigate the global rupture parameters for deep and intermediate‐depth earthquakes. From measurements of rupture duration and radiated seismic energy we estimate stress drop, apparent stress, and radiation efficiency and obtain a detailed earthquake energy budget. From scaling of the source parameters we highlight differences between crustal and deep seismicity, with the latter showing larger fracture energies. The observed increase of radiation efficiency with depth suggests that rupture mechanism for deep and intermediate‐depth events differs. In agreement with previous studies we observe along‐strike variability of rupture properties for deep and intermediate‐depth earthquakes, correlating with slab morphology, plate age, or presence of volcanic structures.

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Section: Discussionsupporting

confidence: 89%

Global rupture parameters for deep and intermediate‐depth earthquakes

Poli

Prieto

2016

JGR Solid Earth

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“…[]. The source scaling, depth dependence, and spatial variations of source duration of these earthquakes are studied at both global and regional scales and compared with previous studies [ Houston et al ., ; Persh and Houston , ; Tocheport et al ., ; Campus and Das , ].…”

Section: Introductionmentioning

confidence: 87%

Global and along‐strike variations of source duration and scaling for intermediate‐depth and deep‐focus earthquakes

Poli

Prieto

2014

Geophysical Research Letters

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The systematic behavior of earthquake rupture as a function of earthquake magnitude and/or tectonic setting is a key in our understanding of the physical mechanisms involved during earthquake rupture. Geophysical evidence suggests that although deep earthquakes-including intermediate-depth and deep-are similar to shallow ones, the mechanism involved during deep earthquakes is different from that of shallow ones. In particular, the magnitude and depth dependence of scaled duration, a measure of earthquake rupture duration, has led to controversy of what controls deep earthquake behavior. Here we estimate scaled source durations for 600 intermediate-depth and deep-focus earthquakes recorded at teleseismic distances and show deviation from self-similar scaling. No depth dependence is observed which we interpret as due to little differences between intermediate-depth and deep-focus earthquake mechanisms. The data show no correlation between durations and plate age or thermal parameters, suggesting that the thermal properties of the plate have little effect on source durations. We nevertheless report differences in average source duration and scaling between subduction zones and along-strike variations of source durations that more closely resemble the geometry of subduction (flat or steep subduction) rather than plate age.

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“…Rupture duration is generally found to be proportional to the cube root of seismic moment, M o [ Kanamori and Anderson , 1975; Houston et al , 1998; Campus and Das , 2000]. Each duration estimate is divided by the cube root of the estimated earthquake M o from the Harvard CMT catalog, normalized to a moment magnitude ( M w ) 6.0 event.…”

Section: Methodsmentioning

confidence: 99%

Radiated seismic energy and earthquake source duration variations from teleseismic source time functions for shallow subduction zone thrust earthquakes

2004

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[1] Earthquake source time functions deconvolved from teleseismic broadband P wave recordings are used to examine rupture variations for 417 underthrusting earthquakes located on the interplate interface in circum-Pacific subduction zones. Moment-scaled duration of significant moment release varies with depth, with longer-duration events occurring in the shallowest 20 km of the megathrusts. The source time functions are also used to estimate radiated seismic energy. Two estimates are obtained: a simple scaled triangle substitution for the moment release history provides a minimum estimate, while integration of the time function shape provides an estimate limited only by the bandwidth of the teleseismic deconvolutions. While these energy calculations underestimate total energy, they enable systematic comparisons of rupture process within and between subduction zones. We do not find significant depth dependence for radiated energy overall, but some regions do show mild trends of increasing energy/seismic moment ratios (E/M o ) with increasing source depth that correspond to rupture duration variations in those regions. The observations of longer rupture duration at shallow depth with moderate E/M o may be due to heterogeneous friction and structural features on the shallow plate interface.INDEX TERMS: 7215 Seismology: Earthquake parameters; 7230 Seismology: Seismicity and seismotectonics; 8164 Tectonophysics: Stresses-crust and lithosphere; KEYWORDS: radiated energy, shallow subduction, source parameters Citation: Bilek, S. L., T. Lay, and L. J. Ruff (2004), Radiated seismic energy and earthquake source duration variations from teleseismic source time functions for shallow subduction zone thrust earthquakes,

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Comparison of the rupture and radiation characteristics of intermediate and deep earthquakes

Cited by 33 publications

References 27 publications

Global rupture parameters for deep and intermediate‐depth earthquakes

Global rupture parameters for deep and intermediate‐depth earthquakes

Global and along‐strike variations of source duration and scaling for intermediate‐depth and deep‐focus earthquakes

Radiated seismic energy and earthquake source duration variations from teleseismic source time functions for shallow subduction zone thrust earthquakes

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