A new study in the journal Geology is the latest to tie a string of unusual earthquakes, in this case, in central Oklahoma, to the injection of wastewater deep underground. Researchers now say that the magnitude 5.7 earthquake near Prague, Okla., on Nov. 6, 2011, may also be the largest ever linked to wastewater injection. Felt as far away as Milwaukee, more than 800 miles away, the quake—the biggest ever recorded in Oklahoma--destroyed 14 homes, buckled a federal highway and left two people injured. Small earthquakes continue to be recorded in the area.
The MOOS experiment seeks to understand the structure and dynamics of subduction in the region of the 1964 Alaska earthquake, one of the three largest recorded (Mw 9.2), where terrane collision is
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|
|Ge Jin||Graduate Research Assistant||Seismology|
|Tobias Diehl||Postdoctoral Research Scientist||Seismology, Earthquake Location, Local Earthquake Tomography, Signal Processing, Tectonophysics, Geodynamics|
|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 geologic time. Prof. Ekström's teaching interests include Environmental Geology, in particular the science and policy aspects of the assessment and mitigation of Geologic Hazards.|
|Felix Waldhauser||Lamont Research Professor||earthquake seismology, seismotectonics of active plate boundaries, real-time seismology|
|James Gaherty||Lamont Research Professor||Earthquake Seismology, Geodynamics|
|Arthur L. Lerner-Lam||Deputy Director||Seismology; focus on upper mantle structures.|
|Mark H. Anders||Associate Professor||Continental deformation using structural geology, seismology, and and other disciplines.|
|Leonardo Seeber||Lamont Research Professor|
|Paul G. Richards||Special Research Scientist||Theory of seismic wave propagation, the physics of earthquakes, the Earth's inner core, improvements in estimating earthquake locations, monitoring underground nuclear explosions, nuclear arms control|
|Lynn R. Sykes||Higgins Professor Emeritus||Earthquake Studies, Control of Nuclear Weapons, Tectonics, Natural Hazards.|
|Won-Young Kim||Lamont Research Professor||Earthquakes in stable continental regions, regional seismic wave propagation, monitoring underground nuclear explosions, observational seismology|
March 26, 2013
November 19, 2012
During Hurricane Sandy the seas rose a record 14-feet in lower Manhattan. Water flooded city streets, subways, tunnels and even sewage treatment plants. It is unclear how much sewage may have been released as plants lost power or were forced to divert untreated wastewater into the Hudson River.
October 02, 2012
This spring, a Swedish scientist sparked international concern with a journal article saying that radioactive particles detected in 2010 showed North Korea had set off at least two small nuclear blasts--possibly in experiments designed to boost the yields of much larger bombs. Shortly after, the pot was stirred with separate claims that some intelligence agencies suspected the detonations were done in cooperation with Iran. Now, a new paper says the tests likely never took place—or that if they did, they were too tiny to have any military significance. The new report, by seismologists at Columbia University’s Lamont-Doherty Earth Observatory, will be published later this month in the journal Science & Global Security, where the earlier paper also appeared.
January 20, 2011
Lamont-Doherty Earth Observatory director G. Michael Purdy has been named Columbia University’s executive vice president for research. Taking over as interim director of the observatory is associate director Arthur Lerner-Lam. The moves, effective Feb. 1, were announced by Columbia president Lee Bollinger and Earth Institute director Jeffrey Sachs in emails to staff Jan. 19.
January 05, 2011
Dr. John Ertle “Jack” Oliver, a geophysicist whose research helped revolutionize our understanding of the basic forces shaping the planet, died peacefully at his home in Ithaca, N.Y., on Wednesday, Jan. 5, 2011. He was 87.
April 16, 2010
In a research career spanning more than four decades, Paul Richards, a seismologist at Lamont-Doherty Earth Observatory, has helped uncover Earth’s inner structure and advanced techniques for detecting nuclear explosions to ensure that bans on nuclear testing can be enforced. Richards will receive the Seismological Society of America’s Harry Fielding Reid medal at its annual luncheon on Wednesday, April 21.
February 22, 2010
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...
January 22, 2010
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.
September 23, 2009
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.
May 27, 2009
Seismologists, Pinpointing Location, See Little Doubt It Was Bomb
Seismologists who have intensively studied North Korea’s nuclear testing efforts say Monday’s blast was certainly a nuclear bomb, roughly five times larger than the country’s first test in 2006.
August 25, 2008
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.
November 20, 2006
Ordinarily, losing almost all of one's instruments would be considered a severe setback to any scientist. But when Maya Tolstoy, a marine geophysicist at the Lamont-Doherty Earth Observatory and the Earth Institute at Columbia University, recently learned that two-thirds of the seismometers she placed on the floor of the Pacific Ocean were trapped more than 8,000 feet (2500 meters) underwater, it turned out to be an extremely good sign.
March 23, 2006
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.
July 20, 2005
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.
March 12, 2004
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
Lamont Doherty Researcher Develops New Use For Seismic Reflection Data: Revealing Locations And Potentials For Mega EarthquakesAugust 08, 2003
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.
May 02, 2003
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).
|Seismologists Monitor North Korea Nuclear Blast|
|Paul Richards on Trends in Monitoring of Nuclear Weapons Testing|
|Revising Paradigms of Plate Tectonics for the Western United States||Earth Science Colloquium|
|Detecting and Measuring Landslides with Seismology||Part of the 2010 Public Lecture Series|
|Rupturing Continental Lithosphere in the Main Ethiopian Rift||A Hot Plume Meets a Cold Craton|
|Earthquake Research||at Lamont Doherty Earth Observatory|
|From Satellites to Camels||In East Africa Studying the Biggest Magmatic Rift Event Ever Seen|
|Global Seismicity and Unusual Earthquakes||Earth Science Colloquium, 2007|
|The 100th Anniversary of the San Francisco Earthquake of 1906||What We Have Learned About the Earthquake Process and the Prospects for Earthquake Prediction|
|The 100th Anniversary of the San Francisco Earthquake of 1906||What Have We Learned Since Then About the Earth-Quake Process and Prospects for Earthquake Prediction|