Rocks and ice are slip-sliding away in the LDEO Rock Mechanics lab.
SG&T scientists employ a broad spectrum of tools and techniques to develop a better understanding of the mechanics and dynamics of earthquakes and faulting. These techniques include labor
Our project will focus on the subduction zone off southern Alaska, which produces large and destructive earthquakes.
A project using multichannel seismic reflection data collected on research cruises in the Marmara Sea to study the earthquake hazard and basin growth along a continental transform fault, the North
A multidisciplinary team of scientists undertook a 20-day research cruise on the Research Vessel Endeavor to map the effects of the Haitian earthquake offshore.
This project is a collaboration between several US and Turkish research institutes to study the tectonics of the Marmara Sea.
Our Ocean Bottom Seismology (OBS) Laboratory develops and operates cutting-edge instrumentation for measuring deformation of the ocean floor in a variety of experimental settings. One of our prima
Earthquakes, volcanoes, landslides, floods, drought, cyclones and other natural hazards have significant potential to affect human lives and society.
Virtual Ocean integrates the GeoMapApp tool suite and the NASA World Wind 3-D
Earthquakes in Greater New York-Philadelphia Area: Catalog 1677 to 2005 and Tectonic Setting
Historical data for I.G.Y. Calibration. The original is by H. Miller.
We mapped the surface trace of the fault rupture for about 5 km on the west bank of the Khunar River, through Balakot and into the Sarash Valley where it apparently ends.
Deployment of a wide-band OBS in the Gulf of California from the R/V New Horizon in Oct 2005. Seismometer is housed in the green sphere, while recording, power, and communications devices are encl
Lamont has been a pioneer in the design, deployment, and utilization of global seismographic networks. This document details an early study of long period seismograph calibrations.
| Name | Title | Fields of interest | |
|---|---|---|---|
| Tarini Bhatnagar | Graduate Student | Earthquakes, Marine Geophysics, mid-ocean ridges, Sedimentology | |
| Nicholas van der Elst | Postdoctoral Research Scientist | ||
| Tobias Diehl | Postdoctoral Research Scientist | Seismology, Earthquake Location, Local Earthquake Tomography, Signal Processing, Tectonophysics, Geodynamics | |
| Joshua Calkins | Adjunct Associate Research Scientist | earthquake seismology, tectonics, lithospheric structure, subduction zones | |
 |
Won-Young Kim | Lamont Research Professor | Earthquakes in stable continental regions, regional seismic wave propagation, monitoring underground nuclear explosions, observational seismology |
 |
Leonardo Seeber | Special Research Scientist | |
 |
Klaus H. Jacob | Special Research Scientist | seismology, engineering seismology, climate change adaptation, disaster risk management, loss modeling, quantitative hazard assessment and mapping |
 |
James Gaherty | Lamont Research Professor | Earthquake Seismology, Geodynamics |
| Felix Waldhauser | Lamont Research Professor | earthquake seismology, seismotectonics of active plate boundaries, real-time seismology | |
 |
Göran Ekström | Professor | Göran Ekström's main research interest is global earthquake seismology. This includes the detailed study of individual earthquake ruptures, and the relationship between seismicity and the large scale tectonic deformation of the crust and mantle over geolo |
 |
Delwayne R. Bohnenstiehl | Adjunct Associate Research Scientist | Seismotectonic Processes at Mid-Ocean Ridges, Passive Underwater Acoustics |
| Ashley Shuler | Graduate Research Assistant | I use earthquake source parameters to constrain deformation processes in volcanoes and rift zones. |
Using newly refined analysis methods, scientists have discovered that a North Korean nuclear bomb test last fall set off aftershocks over a period of eight months on a previously unmapped earthquake fault nearby.
In a new study in Science Advances, researchers at Columbia University show that machine learning algorithms could pick out different types of earthquakes from three years of earthquake recordings at Geysers in California. The repeating patterns of earthquakes appear to match the seasonal rise and fall of water-injection flows into the hot rocks below, suggesting a link to the mechanical processes that cause rocks to slip or crack, triggering an earthquake.
Lamont seismologist Lynn Sykes has been working for more than 50 years to halt the testing of nuclear weapons. His work, along with that of others, has demonstrated that clandestine underground tests can be detected and measured with seismic waves.
Tightly consolidated sediments along a portion of the Cascadia Subduction Zone contribute to locking of the fault along the plate boundary for long intervals, major earthquakes, and the potential for a large tsunami.
During a show at the Hayden Planetarium, seismologist Ben Holtzman explains how he turns earthquake data into captivating sounds and visualizations.
When a fault slips, the temperature can spike by hundreds of degrees, high enough to alter organic compounds in the rocks and leave a signature. A team of scientists at Columbia University’s Lamont-Doherty Earth Observatory has been developing methods to use those organic signatures to reconstruct past earthquakes and explore where those earthquakes started and stopped and how they moved through the fault zone. The information could eventually help scientists better understand what controls earthquakes.
Off the coast of New Zealand, there is an area where earthquakes happen in slow-motion as two tectonic plates grind past one another. Unlike typical earthquakes that rupture over seconds, these slow-slip events take more than a week, creating an ideal lab for studying fault behavior along the shallow portion of a subduction zone.
Scientists analyzing a volcanic eruption at a mid-ocean ridge under the Pacific have come up with a somewhat contrarian explanation for what initiated it. Many scientists say undersea volcanism is triggered mainly by upwelling magma that reaches a critical pressure and forces its way up. The new study says the dominant force, at least in this case, was the seafloor itself – basically that it ripped itself open, allowing the lava to spill out. The eruption took place on the East Pacific Rise, some 700 miles off Mexico.
A new film takes viewers from the eastern highlands of India to the booming lowland metropolis of Dhaka, the capital of Bangladesh—and explores an ever-more detailed picture of catastrophic earthquake threat that scientists are discovering under the region.
When an earthquake strikes, it sends waves of energy ringing through the interior of the planet. The waves are too slow for us to hear in their original state, but speed them up and the earthquake’s global impact comes to life. A group of scientists and sound artists working with the Seismic Sound Lab at Columbia University’s Lamont-Doherty Earth Observatory are turning seismic waves into sound and images for an eye-opening educational performance about earthquakes and what seismic waves can tell us about our planet. You can see, hear and feel seismic data from enormous earthquakes, witness the patterns of decades of earthquakes in minutes, and see the seismic effect of ocean storms, including Hurricane Sandy, all as though you were inside the planet.
A huge earthquake may be building beneath Bangladesh, the most densely populated nation on earth. Scientists say they have new evidence of increasing strain there, where two tectonic plates underlie the world’s largest river delta. They estimate that at least 140 million people in the region could be affected if the boundary ruptures; the destruction could come not only from the direct results of shaking, but changes in the courses of great rivers, and in the level of land already perilously close to sea level.
Christopher Scholz is being awarded the Harry Fielding Reid Medal for his pioneering work in rock mechanics and his skill at communicating earthquake science. The Seismological Society of America cites Scholz’s wide range of contributions over a nearly 50-year career.
Last Thursday, thousands of people from southern New Jersey to Long Island and coastal Connecticut felt the earth tremble. Between 1:20 pm and 2:40 pm, dishes, desks and buildings shook for up to 20 seconds—in some locations, several times. With everyone thinking earthquake, Twitter and Facebook lit up; news reporters scrambled; calls poured into police, the U.S. Geological Survey, and Columbia University’s Lamont-Doherty Earth Observatory, which maintains the region’s network of 50-some seismographic stations.
Rarely a day goes by without earthquakes shaking the Alaska Peninsula, a string of volcanoes curving off the Alaska mainland into the Pacific. Just off shore, two tectonic plates are converging: The Pacific plate is bending under the North American plate and pushing deep into the Earth. Along this subduction zone, scientists have noticed something unusual. Two adjacent sections that appear almost identical in large-scale characteristics—temperature, angle of subduction, age of the rocks—are exhibiting very different earthquake behaviors over short spans of just tens of kilometers. One section is highly active with small earthquakes; the other is more quiet but has large earthquakes every 50 to 75 years. To get a closer look, Lamont-Doherty Earth Observatory’s research ship, the R/V Marcus G. Langseth, ran seismic surveys to map the ocean floor and the earth beneath it.
Most earthquakes erupt suddenly from faults near Earth’s surface, and the big ones can topple cities. But miles below, rocks heated to the consistency of wax moving over thousands to millions of years may be the driving force behind some of these events.
Large earthquakes from distant parts of the globe are setting off tremors around waste-fluid injection wells in the central United States, says a new study. Furthermore, such triggering of minor quakes by distant events could be precursors to larger events at sites where pressure from waste injection has pushed faults close to failure, say researchers.
A new study in the journal Nature provides fresh insight into deep-earth processes driving apart huge sections of the earth’s crust. The process, called rifting, mostly takes place on seabeds, but can be seen in a few places on land—nowhere more visibly than in the Afar region of northern Ethiopia. (See the slideshow below.) Here, earthquakes and volcanoes have rent the surface over some 30 million years, forming part of Africa’s Great Rift Valley. What causes this, and does it resemble the processes on the seafloor, as many geologists think?
Scientists from Columbia University’s Earth Institute will present important new studies at the Dec. 3-7 meeting of the American Geophysical Union, the world’s largest gathering of earth and space scientists. Below: a chronological guide. Most researchers are at our Lamont-Doherty Earth Observatory (LDEO).More info: http://fallmeeting.agu.org/2012/ Reporters may contact scientists directly at any time, or call press officers:
Scientists from Columbia University’s Earth Institute will present important new studies at the Dec. 3-7 meeting of the American Geophysical Union, the world’s largest gathering of earth and space scientists. Below: a chronological guide. Most researchers are at our Lamont-Doherty Earth Observatory (LDEO).More info: http://fallmeeting.agu.org/2012/ Reporters may contact scientists directly at any time, or call press officers:
Earthquakes that have shaken an area just outside Youngstown, Ohio in the last nine months—including a substantial one on New Year’s Eve—are likely linked to a disposal well for injecting wastewater used in the hydraulic fracturing process, say seismologists at Columbia University’s Lamont-Doherty Earth Observatory who were called in to study the quakes.
For all of its violent destruction, the earthquake that struck Haiti on Jan. 12, 2010, hardly scratched the surface of the island. But scientists now say they have found some of the best clues to understanding the quake under water.
After the recent great quakes that have swept away entire coastlines and cities in Japan, Haiti and Sumatra, scientists are now looking hard at the nation that may suffer the gravest threat of all: Bangladesh. A new documentary from the Earth Institute follows seismologists as they trace signs of deeply buried active faults, past movements of the earth, and sudden, catastrophic river-course changes.
Starting today, armchair explorers will be able to view parts of the deep ocean floors in far greater detail than ever before, thanks to a new synthesis of seafloor topography released through Google Earth. Developed by oceanographers at Columbia University’s Lamont-Doherty Earth Observatory from scientific data collected on research cruises, the new feature tightens resolution in covered areas from the former 1-kilometer grids to just 100 meters.
The recent earthquake in Japan shifted the earth’s axis by half a foot. You may be wondering if that’s enough to change earth’s weather. No, not really, says Jerry McManus, a climate scientist at Columbia’s Lamont-Doherty Earth Observatory.
The largest recorded earthquake in Japan's history has triggered a series of events that have killed thousands, crushed and submerged cities, and left a financial toll from which it will take years for an already struggling economy to recover.
Each year, dozens of small, mostly harmless earthquakes quakes rattle the northeastern United States and southern Canada, and one quite active area runs along the shores of lakes Erie and Ontario, in western New York. In order to learn more about what generates these, and the possible threat of something bigger, scientists at Columbia University’s Lamont-Doherty Earth Observatory have installed a new seismometer at the West Valley Central School, southeast of Buffalo.
An earthquake with the following parameters has occurred:
Time: Wednesday, June 23, 2010 at 17:41:42 UTC, 13:41:42 EDT (1:42 PM in NY)
Location: 45.862 °N, 75.457 °W (Southern Ontario), approximately 53 KM (33 mi) NNE from Ottawa
Depth: 18 km (11.2 mi) set by location program
Magnitude 5.0
In nature, random signals often fall mysteriously in step. Fireflies flashing sporadically in early evening soon flash together, and the same harmonic behavior can be seen in chirping crickets, firing neurons, swinging clock pendulums and now, it turns out, rupturing earthquake faults.
This week U.S. and Haitian scientists will start a 20-day research cruise off Haiti to address urgent questions about the workings of the great Jan. 12 earthquake, and the possibility of continuing threats. They hope to gather sonar images, sediments and other evidence from the seafloor that might reveal hidden structures...
The earthquake that struck Haiti took place along what is called a strike-slip fault—a place where tectonic plates on each side of a fault line are moving horizontally in opposite directions, like hands rubbing together. When these plates lock together, stress builds; eventually they slip; and this produces shaking.
That rumbling you feel is not necessarily a passing subway. New York City and the surrounding region gets a surprising number of small earthquakes, and a 2008 study from the region’s network of seismographs, run by Lamont-Doherty Earth Observatory, suggests that the risk of a damaging one is not negligible. This week, the federal government announced a major upgrade to that network.
Indian Point Nuclear Power Plant Seen As Particular Risk
A study by a group of prominent seismologists suggests that a pattern of subtle but active faults makes the risk of earthquakes to the New York City area much greater than formerly believed.
Dec 10, 2007--Scientists from Columbia University’s Lamont-Doherty Earth Observatory will report this week on vital topics including new evidence of the effects of climate change; technologies to confront it; studies of eastern U.S. earthquake risk; and previously unseen inner workings of the deep polar ice caps. The reports will be presented at the fall 2007 American Geophysical Union (AGU), the largest earth-sciences gathering in the world, Dec. 10-14 in San Francisco.
Seismologists at Columbia University and Harvard University have found a new indicator that the Earth is warming: "glacial earthquakes" caused when the rivers of ice lurch unexpectedly and produce temblors as strong as magnitude 5.1 on the moment-magnitude scale, which is similar to the Richter scale. Glacial earthquakes in Greenland, the researchers found, are most common in July and August, and have more than doubled in number since 2002.
When the sea floor off the coast of Sumatra split on the morning of December 26, 2004, it took days to measure the full extent of the rupture. Recently, researchers at Columbia University's Lamont-Doherty Earth Observatory analyzed recordings of the underwater sound produced by the magnitude 9.3 earthquake.
The Maurice Ewing, owned by the National Science Foundation and operated by the Lamont-Doherty Earth Observatory (L-DEO), is the only research vessel devoted to obtaining images of the deep earth for fundamental earth science research.
Finding the epicenter of earthquakes has not changed in principle since the 1930s -- after closely examining seismograms from different widely-spaced listening stations, researchers decide on the arrival times of various seismic waves and calculate an approximation. In practice this can result in errors of several miles
Researchers have found an important new application for seismic reflection data, commonly used to image geological structures and explore for oil and gas. Recently published in the journal Nature, new use of reflection data may prove crucial to understanding the potential for mega earthquakes.
Detailed analysis of regional and teleseismic waveform data from the June 18, 2002, Evansville, Indiana earthquake indicates that the earthquake occurred at a depth of about 18 km (±2 km).
