A peak in seismic P-wave – S-wave velocity ratios at the lithosphere-asthenosphere boundary beneath old Pacific lithosphere requires an additional property besides temperature as an explanation.
plate tectonics
Posted inEditors' Highlights
Olivine Micropillars Reveal Shallow Lithosphere Rheology
Micrometer scale investigation of the rheological properties of olivine in pressure and temperature conditions corresponding to the shallow lithosphere.
Posted inScience Updates
Evolution of the Asian Monsoon
Climate and topography change the characteristics of the Asian monsoon over millions of years. These changes affect the region’s climate and topography, and the cycle continues.
Posted inEditors' Highlights
The Other, Deeper, South American Flat Slab
Tomographers trace the slab subducting beneath South America into the lower mantle, providing the most complete picture of structure beneath the continent to date.
Posted inNews
A Plate Boundary Emerges Between India and Australia
Bathymetric and seismic data point to a new plate boundary in a fracture-riddled zone beneath the northern Indian Ocean.
Posted inNews
Are We Seeing a New Ocean Starting to Form in Africa?
Although shallow magma storage at Erta Ale volcano hints at a rift-to-ridge transition, the tectonic future of the Afar region is far from certain.
Posted inNews
Walter C. Pitman III (1932–2019)
Pitman pioneered research on seafloor spreading, proposed a scientific backstory to the Great Flood and Noah’s Ark, and reveled in spirited discussions of all kinds.
Posted inNews
Geodetic Data Pinpoint Earthquake-Prone Regions of the Himalayas
GPS measurements of the Indian and Eurasian plates reveal four locked segments most likely to produce large earthquakes.
Posted inNews
Sediments May Support the Mediterranean Megaflood Hypothesis
Millions of years ago, the Mediterranean Sea may have evaporated. A newly identified body of sediments could have been deposited by the giant flood that refilled the basin.
Posted inEditors' Highlights
What Controls How Quickly Faults Heal?
The rates at which fault zones “heal” through secondary mineralization have been elusive, but uranium-thorium dating of calcite growth in fault-zone fractures may provide the answer.