Marine active‐source seismic studies in the Japan Trench: a seismogenic zone in an ocean‐continent collision zone

Investigation of the strength and trend of seismic anisotropy beneath the Zagros collision zone

The Zagros collision zone is known as an active tectonic zone that represents the tectonic boundary between the Eurasian and Arabian plates. A popular strategy for gaining insight into the upper mantle processes is to examine the splitting of seismic shear waves and interpret them in terms of upper mantle anisotropy and deformation. Core phases SK(K)S from over 278 earthquakes (MW ≥ ...

Geodetic and seismic constraints on some seismogenic zone processes in Costa Rica

[1] New seismic and geodetic data from Costa Rica provide insight into seismogenic zone processes in Central America, where the Cocos and Caribbean plates converge. Seismic data are from combined land and ocean bottom deployments in the Nicoya peninsula in northern Costa Rica and near the Osa peninsula in southern Costa Rica. In Nicoya, inversion of GPS data suggests two locked patches centered...

Crustal structure in the northwestern part of the Izu collision zone in central Japan

The Izu-Bonin arc (IBA) has been colliding with the Honshu arc since the middle Miocene, which together form the active Izu arc-arc collision zone (ICZ) in central Japan. To understand the entire collisional system, we have used refraction/wide-angle reflection data to model velocity structures of the Honshu arc, northwest of the ICZ. The seismic data indicate that the upper 4-km crust of the H...

Deep Structure of the Northeast Tibetan Collision Zone: INDEPTH IV The Himalaya-Tibet Collision Zone

The Himalayan Mountain Belt and adjacent Tibetan Plateau (Figure 1) remain the world’s foremost natural laboratory for investigation of continental collisional tectonics. The continuing debate over how the Asian continent has responded to the embedding of the Indian subcontinent has variously revolved around concepts such as distributed shortening (e.g. Dewey and Burke, 1973), wholesale contine...

Upper limit on damage zone thickness controlled by seismogenic depth