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The grey line in the rock, running from the foreground away under the boulder towards the mountains, is one of the shear zones from the study area. Credit: Lucy Campbell

‘Fossil earthquakes’ offer new insight into seismic activity deep below Earth’s surface

Geology Page - March 17, 2020

Japan's risk of giant tsunamis may have grown when the angle of a down-going slab of ocean crust declined. Top: ocean crust (right) slides under continental crust at a steep angle, causing faulting (red lines) in seafloor sediments piled up behind. Bottom: as the angle shallows, stress is transferred to sediments piled onto the continental crust, and faults develop there. Blue dots indicate resulting earthquakes. At left in both images, the change in angle also shifts the region where magma fueling volcanoes is generated, pushing eruptions further inland. Credit: Adapted from Oryan and Buck, Nature Geoscience 2020

Shifts in deep geologic structure may have magnified great 2011 Japan tsunami

The SHIRE project, which contributed resources to this research, is investigating seamounts within the Hikurangi Trench, to learn how they generate or dampen earthquakes at different stages of subduction. This seismic image shows a seamount known as Puke Seamount, colliding with New Zealand. Image: SHIRE/Andrew Gase.

Sinking sea mountains make and muffle earthquakes

Research suggest that rocks colliding inside fault zones, like this one in Maine, may contribute to damaging high-frequency earthquake vibrations. Credit: Julia Carr

Researchers develop new explanation for destructive earthquake vibrations

Scientists used the model to calculate seismic risk in the L.A. Basin

Source of Indonesian earthquakes and tsunamis located

Core samples from the fault zone of the Japan Trench were recovered by the JFAST project and analyzed for evidence of past large earthquakes.

Seismic biomarkers in Japan Trench fault zone reveal history of large...

Geology Page - January 27, 2020

A map of Vancouver Island showing the locations of seismic instruments considered by the research group. The grey shaded region delineates where slow earthquakes occur.

Researchers find evidence to explain behavior of slow earthquakes

Geology Page - January 27, 2020

Fault zone with broken rock inside stippled lines and faulting directions of each rock segment outlined by half arrows. Photo credit: Henrik Drake. Illustration: Mikael Tillberg.

A new method for dating ancient earthquakes

Geology Page - January 20, 2020

seismogram

Magnitude of Great Lisbon Earthquake may have been lower than previous...

Geology Page - January 7, 2020

Unlike regular earthquakes, which can cause visible damage, slow earthquakes cannot be felt at the Earth's surface. Credit: Pixabay/ marcellomigliosi1956, licensed under pixabay license

The ‘slow earthquakes’ that we cannot feel may help protect against...

Geology Page - December 10, 2019

Seismogram

Analyzing seismic patterns to forecast the magnitude of the largest earthquake...

Geology Page - December 10, 2019

Kilauea

California is famous for earthquakes, wildfires and Volcanoes

Geology Page - December 2, 2019

Researchers employed 20 kilometers (pink) of a 51-kilometer undersea fiber-optic cable, normally used to communicate with an off-shore science node (MARS, Monterey Accelerated Research System), as a seismic array to study the fault zones under Monterey Bay.

Underwater telecom cables make superb seismic network

Geology Page - November 28, 2019

The shallow water buoy can detect small movements and changes in the Earth's seafloor that are often a precursor to deadly natural hazards, like earthquakes, volcanoes and tsunamis. Credit: University of South Florida

New technology developed to improve forecasting of Earthquakes, Tsunamis

Geology Page - November 24, 2019

The excavation of trench B at the Leigh Lake site. Shown in the photo (from left to right) are Glenn Thackray, Cooper Brossy, and Darren Zellman. Credit: Mark Zellman

Evidence of two quakes extends rupture history in Grand Tetons National...

Geology Page - November 19, 2019

This simplified hydrology model shows the subsurface of Oklahoma. The Arbuckle Group is the area where most wastewater is injected. This layer allows fluid to move easily to distant areas. The added water causes stress as it travels and can cause earthquakes when it encounters pre-existing faults. Credit: University of Oklahoma

Geoscientists hope to make induced earthquakes predictable

Geology Page - November 7, 2019

Earthquake impact can be affected by seasonal factors, historical study shows

Geology Page - November 7, 2019

Studying the snowmelt episodes of a Pyrenean river with a seismometer

Geology Page - November 7, 2019

earthquake in Southern California

Distinguishing earthquake foreshocks and aftershocks

Geology Page - October 14, 2019

Visualization of the modelled coupled earthquake and tsunami across Palu Bay, from Ulrich et al., 2019: Left: Seismic waves being generated while the earthquake propagates southward in a ‘superfast’ manner. Warm colours denote higher movements across the geological faults and higher ground shaking (snapshot after 15 seconds of earthquake simulation time). Right: The movements of the earthquake beneath the bathtub shaped Palu Bay generate a ‘surprise’ tsunami (snapshot of the water waves aftee 20s of simulation time of the tsunami scenario). Image credit: LMU.

Role of earthquake motions in triggering a ‘surprise’ tsunami

Geology Page - September 7, 2019

$Hydraulic fracturing (Creative Commons photo)$

Understanding the link between fracking and earthquakes

Geology Page - September 4, 2019

Map of seismic sensors (green triangles) around the epicenter (red star) of one of the earthquakes near the city of Tsukuba, Ibaraki Prefecture. Credit: 2019 Satoshi Ide

Earthquake study casts doubt on early warnings but hints at improved...

Geology Page - September 4, 2019

A picture of Mt. Aso, including locations of eastern and western clusters. Credit: Aso Geopark Promotion Council

Underground links between quakes and eruptions of Japan’s biggest active volcano

Geology Page - August 25, 2019

Jesse leaning against the fresh fault scarp of the Kekerengu fault, next to some of the curved slickenlines. Credit: Professor Tim Little

Rock scratches hint at future quakes

Geology Page - August 13, 2019

Marine Denolle (right) and her team, including Jiuxun Yin (left) and Brad Lipovsky, created numerical models to predict an earthquake’s final magnitude 10 to 15 seconds faster than today’s best algorithms. Credit: Stephanie Mitchell/Harvard Staff Photographer

Predicting the strength of earthquakes

Geology Page - August 8, 2019

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