Here you will find information about the Lamont-Doherty Cooperative Seismographic Network (LCSN), along with information on earthquakes in the Eastern United States and seismology. We hope you will find this site interesting and informative.Earthquakes in other parts of the world, as well as more information about the Earth Sciences, can be found by navigating through other web site links provided here.

The Lamont-Doherty Earth Observatory (LDEO) is a leading research institution where more than 200 research scientists seek fundamental knowledge about the origin, evolution and future of the natural world. LDEO scientists observe Earth on a global scale, from its deepest interior to the outer reaches of its atmosphere, on every continent and in every ocean. They decipher the long record of the past, monitor the present, and seek to foresee Earths future. From global climate change to earthquakes, volcanoes, nonrenewable resources, environmental hazards and beyond, the Observatorys fundamental challenge is to provide a rational basis for the difficult choices faced by humankind in the stewardship of this fragile planet.

Earth history is punctuated by events during which large volumes of mafic magmas were generated and emplaced by processes unrelated to normal sea-floor spreading and subduction. These Large Igneous Provinces (LIPs) are best preserved in the Mesozoic and Cenozoic where they occur as continental flood basalts, volcanic rifted margins, oceanic plateaus, ocean basin flood basalts, submarine ridges, and seamount chains.

The focal mechanism of the mainshock indicates low angle thrust faulting (dipping 8 degree NE) along a plane striking NNW (329 deg) at a depth of about 29 km. The largest aftershock (Mw 7.1) that occurred northwest of the mainshock in Nicobar Islands appears to be more northerly striking (352 deg), shallow (12 km) and steeply dipping (41 deg). The second largest aftershock also has similar focal mechanism to the largest aftershock. Eight (8) major earthquakes (Mw > 7) during 1976-2004 in the region indicates that low angle, thrust faulting is the predominant mechanisms in the region. Calculated by Won-Young Kim of Lamont-Doherty Earth Observatory.

Please join us on our cruise of discovery to the Lost City Hydrothermal Field at the summit of the Atlantis Massif, 30N on the Mid-Atlantic Ridge. During this 32 day expedition, 24 scientists onboard the research vessel the Atlantis will dive deep into the ocean to explore active limestone chimneys that rise 200 feet above the seafloor. We will also sample and grow microorganisms that may provide information key to understanding the development of early life on Earth, and use a free swimming robot to create a high resolution map of this field--which is unlike any hot spring system yet discovered on our planet. The Lost City vent field is unlike any seafloor hot spring system yet found, and it is likely that exciting new discoveries will be made during this 32-day expedition. Using the submersible Alvin and the free-swimming robotic vehicle ABE, we will explore, map, and sample this novel environment.

Designed to understand the complex interplay of processes that govern the evolution of continental margins from continental rift margins to subduction zones.

To address the potential for conflict and cooperation on water issues, Michigan Technological University has launched the Michigan Tech Water Initiative. The purpose of the Michigan Tech Water Initiative program is to provide the multidisciplinary perspectives and tools to manage water-related problems of local, regional, and international interest. The Michigan Tech Water Initiative has three primary foci: undergraduate and graduate education, technical and policy-related research, and community outreach. The Michigan Tech Water Initiative community consists of any faculty, students, and staff that have water-related interests.

The Mid-American Geospatial Information Center (MAGIC) provides access to NASA remote sensing data. Users include state agencies, federal agencies, regional and local governments, academic institutions, public schools, businesses and the general public. As a catalyst for advanced technology, MAGIC combines products from NASA's remote sensing programs with Texas-based developments in leading-edge information technology, computer visualization techniques and Internet2 data transmission network.

The Monterey Accelerated Research System (MARS) is a cabled-based observatory system, incorporating a benthic instrument node, AUVs, and various benthic and moored instrumentation. The MARS infrastructure will provide the capability to place and power instruments in areas of scientific interest in various geographical sites. This project will complete the design and then install an advanced cabled observatory in Monterey Bay that will serve as the test bed for a state-of-the-art regional ocean observatory, currently one component of the NSF Ocean Observatories Initiative (OOI). The Monterey Accelerated Research System (MARS) cabled observatory represents the next step toward harnessing the promise of new power and communication technologies to provide a remote, continuous, long-term, high-power, large-bandwidth infrastructure for multidisciplinary, in situ exploration, observation, and experimentation in the deep sea. MARS will be located in Monterey Bay offshore the Monterey Bay Aquarium Research Institute (MBARI).

The volcano camera shows an image of Mount St. Helens, taken from the Johnston Ridge Observatory. The Observatory and VolcanoCam are located at an elevation of approximately 4,500 feet, about five miles from the volcano. The view is approximately south-southeast across the North Fork Toutle River Valley. The image automatically updates approximately every five minutes. We expanded the VolcanoCam Images Archives include three VolcanoCam movies! You are now able to download and view the Mount St. Helens eruptions of October 1, October 4 and October 5, 2004. We also have available complete sets of the individual images (from dawn to dusk) of these three days.

he twin GRACE satellites, launched March 17, 2002, are designed to produce a new model of the Earth's gravity field with unprecedented accuracy. The estimates of the time variations in the gravity field obtained from GRACE, in conjunction with other satellite and in-situ data, and geophysical models, can provide improved measurements of deep ocean currents, ocean bottom pressure, sea level rise, sea ice mass variation and distribution, soil moisture, groundwater transport, and land density.

The mission of the National Earthquake Information Center (NEIC) is to rapidly determine location and size of all destructive earthquakes worldwide and to immediately disseminate this information to concerned national and international agencies, scientists, and the general public. As World Data Center for Seismology, Denver, the NEIC compiles and maintains an extensive, global seismic database on earthquake parameters and their effects that serves as a solid foundation for basic and applied earth science research.

Since 1976, the Natural Hazards Research and Applications Information Center (NHRAIC) has served as a national and international clearinghouse of knowledge concerning the social science and policy aspects of disasters. The Center collects and shares research and experience related to preparedness for, response to, recovery from, and mitigation of disasters, emphasizing the link between hazard mitigation and sustainability to both producers and users of research and knowledge on extreme events. A basic goal of the Center is to strengthen communication among researchers and the individuals, organizations, and agencies concerned with reducing damages caused by disasters. More than a quarter century of cultivating discourse among these groups has placed NHRAIC center-stage in both the national and global hazards communities.

The objective of this website is to present recent indicators that describe the present state of the Arctic climate and ecosystem in an accessible, understandable, and credible historical context. A summary of changes are listed in the Table of Indicators. The Arctic is a vast, ice-covered ocean that is surrounded by tree-less, frozen land, which is often covered with snow and ice. The rigors of this harsh environment are a challenge to living, working and performing research in the Arctic. None the less, the Arctic is an ecosystem that teems with life including organisms living in the ice, fish and marine mammals living in the sea, birds, land animals such as wolves, caribou and polar bears, and human societies. The Arctic has been changing in the last 30 years, as noted throughout this website. Some of the clearest indicators of this change are shown below: the warming of spring temperatures in Alaska, the warming of winter temperatures in N Europe, the loss of sea ice area in the central Arctic, and the conversion of tundra to wetlands and shrub lands in E. Siberia and NW Canada and Alaska. These changes in physical conditions also have impacted marine and terrestrial ecosystems.

The goal of the NEPTUNE project is to establish a regional ocean observatory in the northeast Pacific Ocean. The Projects 3,000-km network of fiber-optic/power cables will encircle and cross the Juan de Fuca tectonic plate in the northeast Pacific Ocean, an area roughly 500 km by 1,000 km in size. Approximately 25 experimental sites will be established at nodes along the cable. These sites will be instrumented to interact with physical, chemical, and biological phenomena that operate across multiple scales of space and time. Sensor networks will fill in the volume between nodes and will include multipurpose robotic underwater vehicles that will reside at depth, recharge at nodes, and respond to events such as submarine volcanic eruptions. Via the Internet, the network will provide real-time information and command-and-control capabilities to shore-based users.