Earthquake causes distant tremors off Japan coast

This resource provides an abstract. Japan has a nationwide network to sense tremors triggered from waves that traveled long distances through the Earth�s crust. Data from the 2003 Tokachi-oki ...

Cracks from a Japanese earthquake heal in two years

This resource provides an abstract. Seventeen years of shockwave recordings were used to investigate crack healing after the large March 1997 Tokai region earthquake in Japan. Recordings taken at two ...

Molten rock makes big earthquakes bigger

This resource provides an abstract. A modified friction welding device was used to spin one small cylinder of granite against another at high speed and pressure in order to simulate two plates ...

Improving earthquake warning in Costa Rica

This resource provides an abstract. This study examines seismic waves from a segment of the Middle America subduction zone below Central America that are capable of producing strong earthquakes. ...

Stopping stick-slip seismic events?

This resource provides an abstract. This study models underground frictional resistance in stick-slip seismic events in order to determine the amount of energy needed to weaken a fault plane enough ...

Using GPS for earthquake imaging

This resource provides an abstract. The authors used a dense array of Global Positioning System (GPS) stations to model how the Earth slipped during the 2003 8.0-magnitude Tokachi-Oki earthquake near ...

Details of North African tectonics

Global Positioning System (GPS) and ground-based measurements were used to study coastal shoreline movement after the 2003 6.8-magnitude earthquake in Algeria. The authors recorded ground deformation ...

Using GPS to measure remote earthquakes

A comparison of data from ground measurement stations and seismic observation platforms along with GPS observations provide evidence that the 2003 San Simeon, CA earthquake ruptured in a fan-shaped ...

Silent earthquakes in Cascades

Evidence from GPS and seismometer data indicate that slow faulting has occurred along the plate interface deep beneath the Klamath Mountains nearly every 11 months since at least 1998. Since slow ...

Amplifying seismic waves through the ground

Seismic data from Mexico City indicate that active and passive energy from tremors combined in the 30 meters of soft soil below the city and caused the ground to rock and heave far into central ...

Plumbing the depths of the San Andreas Fault

Seismic monitors at the San Andreas Fault Observatory at Depth project provide vertical seismic profiles. The authors analyzed these profiles to detect microearthquake waves and gain valuable ...

Generalized law for aftershocks

A generalized law for aftershock decay rates is provided through the combination of the Gutenberg-Richter frequency magnitude relation, Bath's law, and the modified Omori's law. Several large quakes ...

GPS method to track ground movement after earthquakes

Global Positioning System (GPS) coordinates from before and after the 2003 8.0-magnitude Tokachi-Oki earthquake in Japan were used to estimate the slip distribution on the plate boundary. The GPS ...

Earth's formations help transfer energy from earthquakes

Data from the 1906 San Francisco earthquake was used to model the transfer of accumulated stresses along the San Andreas fault line. It was found that the Earth's upper mantle and lower crust regions ...

Special section on Eastern Turkey Seismic Experiment

Studies of the early stages and consequences of the ongoing convergence of three tectonic plates in Turkey over the past 10-20 million years are compiled in the 15 December 2003 issue of Geophysical ...

Identifying source of infrasonic waves from Denali earthquake

The source of acoustic signals associated with the 2002 7.9 magnitude Denali earthquake was traced by estimating the speed of the waves as they moved eastward along the Denali fault. The ground ...

Volcanic motion could initiate tsunami waves

Examining post-seismic slip after Japanese earthquake

Background on the 1900 Galveston Hurricane

A report on the 1900 hurricane that devastated Galveston, Texas is available on the AGU Web site. It is a chapter from the book, Hurricane!: Coping with Disaster (AGU, 2003), covering the event ...

Oceanic carbon may help track hurricanes

Satellite measurements of dissolved organic carbon in the wake of oceanic hurricanes and typhoons provide a new way to estimate the atmosphere-ocean interaction during the major storms. Satellite ...