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Parkfield segment of San Andreas fault may host occasional large earthquakes

Although magnitude 6 earthquakes occur about every 25 years along the Parkfield Segment of the San Andreas Fault, geophysical data suggest that the seismic...

Research shows North Texas earthquakes occurring on ‘dead’ faults

Recent earthquakes in the Fort Worth Basin - in the rural community of Venus and the Dallas suburb of Irving - occurred on faults...

What are the three main types of faults?

What is a fault? A fault is a fracture or zone of fractures between two blocks of rock. Faults allow the blocks to move relative...

What Is a Geologic Fault?

A fault is a planar fracture or discontinuity in a volume of rock, across which there has been significant displacement as a result of...

Study Confirms Large Earthquakes along Olympic Mountain Faults

A comprehensive study of faults along the north side of the Olympic Mountains of Washington State emphasizes the substantial seismic hazard to the northern...

Sampling of the active alpine fault in New Zealand reveals extreme...

A recent study published in Nature has demonstrated unusual heat generation and fluid movement in the Alpine Fault of New Zealand that has implications...

Foreshock activities leading up to Pawnee earthquake

A University of Oklahoma geophysics professor, Xiaowei Chen, details the foreshock activities leading up to the Pawnee earthquake, and highlights the complicated relationship between...

How Strike-Slip Faults Form, the Origin of Earthquakes

Structural geologist Michele Cooke calls it the "million-dollar question" that underlies all work in her laboratory at the University of Massachusetts Amherst: what goes...

Faulted Sedimentary Rock Layers, Guatemala

Photograph of faulted sedimentary rock layers exposed in a roadcut in Guatemala. The sedimentary rocks originally were deposited as horizontal layers of sand and...

Signs of past California ‘mega-quakes’ show danger of the Big One...

As Interstate 10 snakes through the mountains and toward the golf courses, housing tracts and resorts of the Coachella Valley, it crosses the dusty...

The Blue Anchor Fault

Found on the Somerset coast in England, this crack in the rocks is a normal fault, where younger rocks have been downthrown by tectonic...

New Zealand quake scientists discover surprise

When researchers in New Zealand drilled deep into an earthquake fault, they stumbled upon a discovery they say could provide a significant new energy...

Where will the next big earthquake hit Istanbul?

The city of Istanbul is focus of great concern for earthquake researchers. This 15-million metropole is situated very close to the so-called North Anatolian...

Earthquakes can make thrust faults open violently and snap shut

It is a common trope in disaster movies: an earthquake strikes, causing the ground to rip open and swallow people and cars whole. The...

Lessons from Parkfield help predict continued fault movements after earthquakes

A new study shows that the San Andreas Fault continued to slip gradually for six to twelve years after the 2004 magnitude 6.0 Parkfield,...

Past Quakes at Fault: Abrupt Sinking of Seal Beach Wetlands

A California State University, Fullerton faculty-student study shows evidence of abrupt sinking of the wetlands near Seal Beach, Calif., caused by ancient earthquakes that...

Fault system off San Diego, Orange, Los Angeles counties could produce...

A fault system that runs from San Diego to Los Angeles is capable of producing up to magnitude 7.3 earthquakes if the offshore segments...

Ventura fault could cause stronger shaking, new research finds

A new study by a team of researchers, including one from the University of California, Riverside, found that the fault under Ventura, Calif., would...

Megathrust earthquakes

The raggedness of the ocean floors could be the key to triggering some of the Earth's most powerful earthquakes, scientists from Cardiff University have...

Earthquake faults are smarter than we usually think

Northwestern University researchers now have an answer to a vexing age-old question: Why do earthquakes sometimes come in clusters? The research team has developed a...

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