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Costs and consequences of natural hazards can be enormous; each year more people and infrastructure are at risk. We develop and apply hazards science to help protect U.S. safety, security, and economic well being. These scientific observations, analyses, and research are crucial for the Nation to become more resilient to natural hazards.Read Our Science Strategy
The Estuarine Physical Response to Storms Project will assess the estuarine and adjacent wetland responses of three Atlantic lagoonal estuaries to major storm events such as Hurricane Sandy. The estuarine systems include the Barnegat Bay-Little Egg Harbor Estuary, the Chincoteague Bay, and Jamaica Bay, NY. Evaluations of sediment transport, geomorphic change, circulation, wetland stability....
The SAFRR Tsunami Scenario is a hypothetical but plausible tsunami created by a magnitude 9.1 earthquake offshore of the Alaskan peninsula. The scenario report was released September 2013 and provides an analysis of the potential impacts along the California coast, intended for those who need to make mitigation, preparedness, and outreach decisions before and after tsunami impacts.
A Direct Method for Calculating Instrument Noise Levels in Side-by-Side Seismometer Evaluations
INTRODUCTION The subject of determining the inherent system noise levels present in modem broadband closed loop seismic sensors has been an evolving topic ever since closed loop systems became available. Closed loop systems are unique in that the system noise can not be determined via a blocked mass test as in older conventional open loop...Holcomb, L. Gary
IRIS/USGS Plans for Upgrading the Global Seismograph Network
PREFACE This report has been prepared to provide information to organizations that may be asked to participate in a program to upgrade the global seismographic network. In most cases, the organizations that will be offered new instrumentation by the U.S. Geological Survey currently operate stations in the World-Wide Standardized Seismograph...Peterson, Jon; Hutt, Charles R.
Description and Preliminary Testing of the CDSN Seismic Sensor Systems
INTRODUCTION The China Digital Seismograph Network (CDSN) is being designed and installed to provide the People's Republic of China with the facilities needed to create a national digital database for earthquake research. The CDSN, which is being developed jointly by the PRC State Seismological Bureau and the U.S. Geological Survey,...Peterson, Jon; Tilgner, Edwin E.
A New Event Detector Designed for the Seismic Research Observatories
A new short-period event detector has been implemented on the Seismic Research Observatories. For each signal detected, a printed output gives estimates of the time of onset of the signal, direction of the first break, quality of onset, period and maximum amplitude of the signal, and an estimate of the variability of the background noise. On the...Murdock, James N.; Hutt, Charles R.
A Note on Transients in the SRO and ASRO Long-Period Data
Data users have occasionally observed pulse-like transients in the long-period waveforms recorded at the Seismic Research Observatories (SRO) and at the Modified High-Gain Long-Period (ASRO) stations. In a recent paper, Dziewonski et al (1981) reported transients associated with earthquake signals record at some SRO stations, and the authors...Peterson, Jon
Design Concepts for a Global Telemetered Seismograph Network
INTRODUCTION This study represents a first step in developing an integrated, real-tlme global seismic data acquisition system -- a Global Telemetered Seismograph Network (GTSN). The principal objective of the GTSN will be to acquire reliable, high-quality, real-time seismic data for rapid location and analysis of seismic events. A...Peterson, Jon; Orsini, Nicholas A.
Preliminary Study of Methods for Upgrading USGS Antarctic Seismological Capability
Purpose The purpose of this study is to evaluate potential methods for obtaining higher quality seismic data from Antarctica. Currently, USGS-sponsored WWSSN stations are located at Scott Base, Sanae Base, and at South Pole Station. Scott and Sanae Stations are located near the coast; data obtained from coastal installations are normally...Holcomb, L. Gary
Test and Calibration of the Digital World-Wide Standardized Seismograph
BACKGROUND During the past decade there has been steady progress in the modernization of the global seismograph network operated by the U.S. Geological Survey (USGS). The World-Wide Standardized Seismograph Network (WWSSN) has been augmented by new stations with advanced instrumentation, including the Seismic Research Observatories (SRO) and...Peterson, Jon; Hutt, Charles R.
Preliminary Design Study for a National Digital Seismograph Network
Introduction Recently, the National Research Council published a report by the Panel on National, Regional, and Local Seismograph Networks of the Committee on Seismology in which the principal recommendation was for the establishment of a national digital seismograph network (NDSN). The Panel Report (Bolt, 1980) addresses both the need and the...Peterson, Jon; Hutt, Charles R.
Preliminary Observations of Noise Spectra at the SRO and ASRO Stations
Introduction The seismic noise spectra presented in this report were derived from SRO and ASRO station data for the purpose of evaluating the performance of the seismic instruments. They are also useful for constructing a spectral estimate of earth noise at a quiet site based on noise samples obtained from a network of globally distributed...Peterson, Jon
Test and Calibration of the Seismic Research Observatory
Introduction The Seismic Research Observatory (SRO) network is generating an important new data base for seismological research. The SRO systems have extended both the range and resolution of seismic measurements beyond the limits of conventional seismographs and the data are recorded in digital format making it convenient to automate...Peterson, Jon; Hutt, Charles R.; Holcomb, L. Gary
The USGS has up-to-date details on the July 6, 2017 event.
Billions of dollars and a decade worth of research are on the line in the instant that a spacecraft touches down on Mars. When deciding where to land on the planet’s rocky surface, it is essential to analyze potential landing sites and their surface characteristics.
Earthquakes are estimated to cost the nation $6.1 billion annually in building stock losses according to an updated report published today by FEMA.
Subduction zone events pose significant threats to lives, property, economic vitality, cultural and natural resources and quality of life. The tremendous magnitudes of these events are unique to subduction zones, and they can have cascading consequences that reverberate around the globe.
Living in the Outer Banks means living with the power of the sea. Jutting out from North Carolina’s coast into the Atlantic Ocean, this series of sandy barrier islands is particularly vulnerable to damage from major storms. In April 2016, another nor’easter was set to strike, but this time, Dare County officials were approached by their local weather forecaster with a new kind of prediction.
USGS analysis of air photos collected June 13 shows that new land created by a May 20 landslide on California’s Big Sur coast is eroding.
When Hurricane Sandy struck the south shore of Long Island, New York, on October 29, 2012, it caused substantial erosion of the beach and dunes. Storm waves cut through Fire Island National Seashore’s wilderness area, forming a breach. The resulting channel allowed water to flow between the Atlantic Ocean and Great South Bay.
The U. S. Geological Survey is poised to bring a dynamic array of science and tools to help decision-makers manage and offset effects of increased drought across the United States, according to a drought plan report released today.
Scientists work in the field before, during and after landfall to improve forecasting and recovery.
USGS scientists analyzing before-and-after air photos have calculated the size of the May 20 landslide on California’s Big Sur coast, about 140 miles south of San Francisco.
USGS is collecting and analyzing air photos to help monitor a huge landslide that occurred May 20 on California’s Big Sur coast.
The USGS Earthquake Hazards Program recently released a new strategic plan for earthquake monitoring entitled the “Advanced National Seismic System – Current Status, Development Opportunities, Priorities, 2017-2027.”