Slab Structure beneath the Japanese Islands and Earthquake Generation

The Slab Portal Beneath the Western Aleutians

Tomographic images of the distribution of shear wave speed beneath the northwestern Pacific delineate the configuration of the subducted oceanic lithosphere beneath the western Aleutian Arc. At ~100 km depth, a fast shear wave speed anomaly lies beneath the Aleutian Arc everywhere east of 173E. Between 164E and 173E, however, seismic velocities at this depth are slow relative to the surrounding...

Waveform modeling of the slab beneath Japan

[1] The tomographic P wave model for the Japan subduction zone derived by Zhao et al. (1994) has two very striking features: a slab about 90 km thick with P wave velocities 3– 6% higher than the surrounding mantle and a mantle wedge with 6% low-velocity anomalies. We study three-component seismograms from more than 600 Hi-net stations produced by two earthquakes which occurred in the downgoing ...

Slab‐plume interaction beneath the Pacific Northwest

[1] The Pacific Northwest has undergone complex plate reorganization and intense tectono‐volcanic activity to the east during the Cenozoic (last 65 Ma). Here we show new high‐resolution tomographic images obtained using shear and compressional data from the ongoing USArray deployment that demonstrate first that there is a continuous, whole‐ mantle plume beneath the Yellowstone Snake River Plain...

the underlying structure of language proficiency and the proficiency level

هدف از انجام این تخقیق بررسی رابطه احتمالی بین سطح مهارت زبان خارجی (foreign language proficiency) و ساختار مهارت زبان خارجی بود. تعداد 314 زبان آموز مونث و مذکر که عمدتا دانشجویان رشته های زبان انگلیسی در سطوح کارشناسی و کارشناسی ارشد بودند در این تحقیق شرکت کردند. از لحاظ سطح مهارت زبان خارجی شرکت کنندگان بسیار با هم متفاوت بودند، (75 نفر سطح پیشرفته، 113 نفر سطح متوسط، 126 سطح مقدماتی). کلا ...

Generation of the Ahlfors Five Islands Theorem