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Remote triggering of ice quakes

On Feb. 27, 2010, a magnitude-8.8 earthquake struck the subduction zone off the coast of Chile. The resulting Rayleigh surface waves rippled around the world, triggering small earthquakes in many different tectonic settings, including Antarctica. As the surface waves moved across the white continent, a third of Antarctic seismic stations reported shaking coming from so-called “ice quakes.”

19 Oct 2014

Triggered tremor along the San Andreas Fault

The San Andreas Fault (SAF) in California is one of the most active in the U.S., but the 1,300-kilometer-long strike-slip fault seems to only be susceptible to small-scale dynamic triggering. After the magnitude-9 Tohoku quake in Japan in 2011, the SAF experienced an elevated incidence of tremor up and down its length. The tiny tremors were recorded at depths between 16 and 30 kilometers, below the fault’s seismogenic zone.

19 Oct 2014

Casting a seismic shadow

In the week or two before the magnitude-8.6 Indian Ocean earthquake in 2012, Earth was unusually quiet, with few large quakes over magnitude 5. Afterward, seismic activity all over the globe was elevated for more than a week. Then, suddenly, global seismicity dropped off precipitously: Beginning two weeks after the mainshock, no earthquakes of magnitude-6.5 or greater occurred for 95 days.

19 Oct 2014

Getting there and getting around in Tucson

Both Phoenix and Tucson are good arrival points for exploring southeastern Arizona, but it’s best to base yourself in Tucson to visit the attractions described here. You will need a car to get around the area; if you choose to fly in, you can rent a vehicle at either city’s airport. Tucson is located about 180 kilometers south of Phoenix on Interstate 10.

15 Sep 2014

Searching the stars

Thanks to its dry climate and soaring peaks, the Tucson region offers some of the best night-sky viewing in the world.

15 Sep 2014

Getting there and getting around Croatia

Although there are no direct flights between the U.S. and Croatia, the capital, Zagreb, is connected year-round to most major European cities, and the Dalmatian Coast airports of Split and Dubrovnik are well connected during the summer. All three offer numerous car rental options; an online consolidator such as Auto Europe can help you efficiently find the best price. One-way rentals are generally only available to other locations in Croatia and Slovenia.
 

20 Jun 2014

Getting there and getting around Tajikistan

Tajikistan is not exactly a hotbed of tourism, but for adventurous geo-travelers, especially those with an interest in dynamic landscapes, Tajikistan offers amazing mountain and glacier climbing, endless backpacking possibilities, and the experience of feeling like you have traveled back in time.
 

16 Jun 2014

Reading the walls

The story of New England’s iconic landform — romanticized by Robert Frost and Henry David Thoreau — highlights the intersections of geologic and human history.

19 May 2014

A new tool for atmospheric studies

Scientists are putting GPS to work in some unexpected new ways, including in atmospheric research.

30 Apr 2014

A truly global system

Like the GPS navigation system in your car or smartphone, a high-precision GPS receiver uses signals from satellites to determine the distance from the receiver to the satellite. But that’s where the similarities end. 

30 Apr 2014

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