Mission Areas L2 Landing Page Tabs
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
To learn more about USGS’ role providing science to decision makers before, during and after Hurricane Harvey, visit the USGS Hurricane Harvey page.
Storm-tide sensors are being installed at key locations along the Texas Gulf Coast by the U.S. Geological Survey in advance of Hurricane Harvey.
The U.S. Geological Survey awarded approximately $4.9 million this week to six universities and a university-governed non-profit, to support transitioning the west coast “ShakeAlert” earthquake early warning system into a production system.
Editor: In the public interest and in accordance with Federal Aviation Administration regulations, the USGS is announcing this low-level airborne project. Your assistance in informing the local communities is appreciated.
Keep tabs on wildfire activity via this U.S. Geological Survey website, GeoMAC.
Join volcano scientists from around the world during scientific meeting and associated public event in Portland.
After the next significant earthquake, many sources will be disseminating information from a variety of accounts, tools and services.
True or False: Lightning that takes place during a volcanic eruption is the same as lightning that occurs during a thunderstorm?
A new U.S. Geological Survey-led study suggests that earthquake-related deformation just below the Earth's surface can be quite different from how it is expressed at the surface.
Twenty-five middle-school girls from 11 cities in Washington and Oregon are participating in the third annual “GeoGirls” outdoor volcano science program at Mount St. Helens, jointly organized by the U.S. Geological Survey and the Mount St. Helens Institute.
Scientists from the USGS Pacific Coastal and Marine Science Center mapped the offshore extent of the Mud Creek landslide on California’s Big Sur coast on July 11, 2017.
The Mud Creek landslide on California’s Big Sur coast keeps eroding.
Media Alert: Reporters wishing to accompany USGS scientists in the field the week of July 10 should contact Bill Coon, 607-220-6280 or email@example.com by 5 pm EDT Friday, July 7.