![]() However, strike-slip seismic events also occur in the second valley and elsewhere in the deformed zone. One of the valleys is seismically highly active and constitutes the present-day principal transform boundary. Examples are the 750-km- long, 120-km-wide Andrew Bain transform on the Southwest Indian Ridge, and the Romanche transform, where the Mid-Atlantic Ridge is offset by a lens-shaped, ˜900-km- long, ˜100-km-wide sliver of deformed lithosphere bound by two major transform valleys. However, we define here a new class of oceanic transform boundaries, with broad complex multifault zones of deformation, similar to some continental strike-slip systems. Oceanic transform plate boundaries consist of a single, narrow (a few kilometers wide) strike-slip seismic zone offsetting two mid- ocean ridge segments. ![]() Ligi, Marco Bonatti, Enrico Gasperini, Luca Poliakov, Alexei N. Oceanic broad multifault transform plate boundaries ![]()
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