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subduction

Photo of the Apennine Mountains in Italy.
Posted inEditors' Highlights

Topography Along the Apennines Reflects Subduction Dynamics

by Duna Roda-Boluda 15 March 202313 March 2023

Topography and exhumation vary strongly along the Apennines, reflecting the geometry of the Moho and different geodynamic mechanisms.

Posted inEditors' Highlights

The Crust Travels to the Earth’s Core and Back in Record Time

by Vincent Salters 16 December 20228 February 2023

Subduction of continental crust around the Gondwana supercontinent may explain the mantle Dupal anomaly of the southern hemisphere.

diagram of a subduction zone
Posted inEditors' Highlights

Tracing Oxidizing Slab Fluids in Cold Volcanic Arcs

by Susanne Straub 28 October 202215 November 2022

Elevated copper isotope ratios in arc magmas from fluid-rich cold subduction zones support the role of oxidizing fluids from the subducted lithospheric serpentinite in the oxidization of arc magmas.

2011年Tōhoku地震后日本Wakuya的鸟瞰图,显示出俯冲地震的破坏力。对太平洋俯冲带的持续重力监测有助于识别出大地震可能发生的地方。图片来源: U.S. Navy/Mass Communication Specialist 3rd Class Alexander Tidd, CC BY-NC 2.0
Posted inResearch Spotlights

东日本大地震前几个月的重力变化

by Sarah Derouin 25 October 202225 October 2022

研究人员利用GRACE卫星数据发现了发生在地球深部的地震事件之前的重力异常信号。

Photo of Cerro Aconcagua, the highest mountain in the Americas
Posted inEditors' Vox

Old Igneous Rocks Hold the Key to Crustal Thickness Evolution

by Peter Luffi and Mihai Ducea 7 September 202229 September 2022

The chemical composition of orogenic igneous rocks and their zircons is sensitive to crustal thickness and can be used to quantify the evolution of Moho depths beneath continents back in time.

A small coastal shipping town in Japan is devastated by an earthquake. In this photo taken from a plane, the wreckage of hundreds of buildings can be seen, and only a handful remain standing. In the center of the image, a small yacht is perched on top of one of the only remaining buildings. The town is surrounded by mountains and forests. One of the plane’s wheels is visible in the lower left corner of the image.
Posted inResearch Spotlights

Months of Gravity Changes Preceded the Tōhoku Earthquake

by Sarah Derouin 1 September 202225 October 2022

Using GRACE satellite data, researchers discovered anomalous gravimetric signals that occurred before a seismic event that started deep within Earth.

A global map of subduction zones. The Mariana Trench is near the center with a zoomed-in image of bathymetry.
Posted inResearch Spotlights

Deep Earthquakes Suggest Well-Hydrated Mariana Subduction Zone

by Morgan Rehnberg 10 August 20222 March 2023

Earthquakes as deep as 50 kilometers below the seafloor were detected by 12 ocean bottom seismometers placed around the Challenger Deep.

Two maps of the study region displaying earthquake depth as colored dots.
Posted inEditors' Highlights

Aftershocks Reveal Coseismic Rupture of Megathrust Earthquakes

by Agnes Helmstetter 28 July 202221 September 2022

More accurate aftershock zones reveal that the rupture areas of megathrust Aleutian–Alaska earthquakes are larger than we thought and partly overlap, in contradiction with the seismic gap hypothesis.

Close-up of an outcrop of an eclogite from the Monviso area of Italy showing a vug, or hole, containing red garnet crystals and green pyroxene crystals.
Posted inNews

Holey Eclogite!

by Alka Tripathy-Lang 1 July 202215 November 2022

Scientists have found holes filled with minerals that indicate fluid-filled pores exist many tens of kilometers below Earth’s surface. But no, The Core fans, you still can’t get amethyst-laden geodes in the mantle.

River flow paths in Iceland derived from HydroSHEDS.
Posted inAGU News

Charting Paths to New Knowledge

by Heather Goss 20 May 20221 June 2022

In our June issue of Eos, we home in on the unique ways researchers are using maps to better understand Earth and beyond.

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