Gravity and magnetic measurements over Bowers Ridge and Shirshov Ridge, Bering Sea

摘要: Bowers ridge, which is submerged in the deep-water part of Bering Sea, has geophysical and structural characteristics an island arc-trench system. Three crustal structure sections strongly curved aseismic ridge based on seismic, magnetic, gravity data, indicate that a volcanic characterized by large-amplitude, short-wavelength magnetic anomalies bordered its convex side sediment-filled trench. Positive greater than 200 mgal are associated with ridge; negative amplitudes 100 bordering The linear, also entirely submerged, Shirshov Sea differ significantly from ridge. Over small amplitude there no evidence buried A straight NE-SW trending chain elongated seamounts, possibly located old transform fault zone, connects may direction late Mesozoic-earliest Tertiary subduction northeast, would have led to construction