Study on finite strain and its relationship with magnetic fabric along Ailao Shan‐Red River shear zone

Zhou, Yuehan; Wu, Shimin; Qiu, Xuelin; Zhou, Ping

doi:10.1029/2003jb002428

Cited by 1 publication

(2 citation statements)

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“…4). Zhou et al (2003) observed that amplification effects due to thick sediment are frequency-dependent for periods less than about 8 s, and that these cannot be modelled by a frequency-independent station amplitude correction term. We suspect therefore that this dispersion is at least partially due to surface sediment effects.…”

Section: Frequency Dependence Of the Datamentioning

confidence: 99%

“…We suspect therefore that this dispersion is at least partially due to surface sediment effects. Zhou et al (2003) observed that amplification effects due to thick sediment are frequency-dependent for periods less than about 8 s, and that these cannot be modelled by a frequency-independent station amplitude correction term. With increasing frequency, amplitude anomalies increase in magnitude and become more scattered.…”

Section: Frequency Dependence Of the Datamentioning

confidence: 99%

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Multiple-frequencySH-wave tomography of the western US upper mantle

Yu¹,

Sigloch²,

Nolet³

2009

Geophysical Journal International

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SUMMARY We estimate the SH‐wave velocity and attenuation structures of the western US upper mantle using the dense network of the USArray and new techniques: we observe a multiple‐frequency data set of both traveltime and amplitude anomalies, and interpret these with full 3‐D finite‐frequency sensitivity kernels. Amplitudes show stronger frequency dependence than traveltimes. We perform a joint inversion on the measured traveltime and amplitude anomalies, interpreting them in terms of velocity and attenuation heterogeneities. Aside from the expected clear division between the slow, tectonically active region in the west and the fast craton in the east, several interesting smaller velocity anomalies are observed. The subduction along the Cascades at 100–300 km depths shows lateral discontinuity, with a ‘slab hole’ (absence of fast anomalies) observed around 45°N. The delaminated Sierra Nevada Mountains root is observed to have sunk to 200 km depth. The Yellowstone plume seems to have an origin (weak slow velocity anomalies) near 1000 km depth, but the plume conduit seems to be interrupted by a fast anomaly, which is identified as a fragment of the Farallon slab. The S‐velocity model shows a trench‐perpendicular ‘slab gap’ (absence of fast anomalies) at almost the same location as in the P model recently published by Sigloch et al. (2008). The methodological improvements described in the first paragraph have several benefits. Amplitude data help to sharpen the edges of narrow velocity heterogeneities in the shallow upper mantle. The focusing effect from velocity heterogeneity dominates over that of attenuation and must be considered when interpreting amplitude anomalies. In general, velocity and attenuation heterogeneities correlate positively, suggesting that temperature plays a major role in forming the anomalies.

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Section: Frequency Dependence Of the Datamentioning

confidence: 99%

Section: Frequency Dependence Of the Datamentioning

confidence: 99%