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Filter Total Items: 4,599
Year Published: 2016

Alternative source models of very low frequency events

We present alternative source models for very low frequency (VLF) events, previously inferred to be radiation from individual slow earthquakes that partly fill the period range between slow slip events lasting thousands of seconds and low-frequency earthquakes (LFE) with durations of tenths of a second. We show that VLF events may emerge from...

Gomberg, Joan S.; Agnew, D.C.; Schwartz, S.Y.
Gomberg, J., Agnew, D.C., and Schwartz, S.Y., 2016, Alternative source models of very low frequency events: Journal of Geophysical Research, Solid Earth, v. 121, p. 2169-9356, doi:10.1002/2016JB013001.

Year Published: 2016

Landslide hazards and climate change: A perspective from the United States: Chapter 14

No abstract available. 

Coe, Jeffrey A.
Coe, J.A., 2016, Landslide hazards and climate change: A perspective from the United States: In: Ho, K.K.S., Lacasse, S., and Picarelli, L. (eds.), Slope safety preparedness for impact of climate change: CRC Press, pp. 479-523.

Year Published: 2016

Building damage survey and microtremor measurements for the source region of the 2015 Gorkha, Nepal, earthquake

We performed a damage survey of buildings and carried out microtremor observations in the source region of the 2015 Gorkha earthquake. Our survey area spans the Kathmandu valley and areas to the east and north of the valley. Damage of buildings in the Kathmandu valley was localized, and the percentage of the totally collapsed buildings was less...

Yamada, Masumi; Hayashida, Takumi; Mori, James; Mooney, Walter
Yamada, Masumi, Hayashida, Takumi, Mori, Jim, and Mooney, Walter D., 2016, Building damage survey and microtremor measurements for the source region of the 2015 Gorkha, Nepal, earthquake: Earth, Planets and Space, 68:117, https://doi.org/10.1186/s40623-016-0483-4.

Year Published: 2016

Changes in blast zone albedo patterns around new martian impact craters

“Blast zones” (BZs) around new martian craters comprise various albedo features caused by the initial impact, including diffuse halos, extended linear and arcuate rays, secondary craters, ejecta patterns, and dust avalanches. We examined these features for changes in repeat images separated by up to four Mars years. Here we present the first...

Daubar, Ingrid J.; Dundas, Colin M.; Byrne, Shane; Geissler, Paul E.; Bart, Gwen; McEwen, Alfred S.; Russell, Patrick; Chojnacki, Matthew; Golombek, M.P.
I.J. Daubar, C.M. Dundas, S. Byrne, P. Geissler, G.D. Bart, A.S. McEwen, P.S. Russell, M. Chojnacki, and M.P. Golombek, 2016, Changes in blast zone albedo patterns around new martian impact craters: Icarus 267 (2016) 86–105, https://doi.org/10.1016/j.icarus.2015.11.032.

Year Published: 2016

Chapter 5: Buildings (EERI Earthquake Reconnaissance Team Report: M7.8 Gorkha, Nepal Earthquake on April 25, 2015 and its Aftershocks)

The most common building typologies in Nepal are reinforced concrete (RC) frame buildings with masonry infill walls, unreinforced masonry (URM) bearing wall buildings, and wood frame buildings (Figure 5-1). The RC frames with masonry infills are commonly constructed in urban and semi-urban areas. Most of these buildings are three to five stories...

Kaushik, Hemant; Bevington, John; Jaiswal, Kishor; Lizundia, Bret; Shrestha, Surya

Year Published: 2016

Orbital monitoring of martian surface changes

A history of martian surface changes is documented by a sequence of global mosaics made up of Mars Global Surveyor Mars Orbiter Camera daily color images from 1999 to 2006, together with a single mosaic from the Mars Reconnaissance Orbiter Mars Color Imager in 2009. These observations show that changes in the global albedo patterns of Mars take...

Geissler, Paul E.; Fenton, L.K.; Enga, M.; Mukherjee, P.
Geissler, P.E., Fenton, L.K., Enga, M., and Mukherjee, P., 2016, Orbital monitoring of martian surface changes: Icarus, v. 278,p. 279-300, https://doi.org/10.1016/j.icarus.2016.05.023.

Year Published: 2016

Seismic‐hazard forecast for 2016 including induced and natural earthquakes in the central and eastern United States

The U.S. Geological Survey (USGS) has produced a one‐year (2016) probabilistic seismic‐hazard assessment for the central and eastern United States (CEUS) that includes contributions from both induced and natural earthquakes that are constructed with probabilistic methods using alternative data and inputs. This hazard assessment builds on our 2016...

Petersen, Mark D.; Mueller, Charles; Moschetti, Morgan P.; Hoover, Susan M.; Llenos, Andrea L.; Ellsworth, William L.; Michael, Andrew J.; Rubinstein, Justin L.; McGarr, Arthur F.; Rukstales, Kenneth S.

Year Published: 2016

Comment on “The reduction of friction in long-runout landslides as an emergent phenomenon” by Brandon C. Johnson et al.

Results from a highly idealized, 2-D computational model indicate that dynamic normal-stress rarefactions might cause friction reduction in long-runout landslides, but the physical relevance of the idealized dynamics has not been confirmed by experimental tests. More importantly, the model results provide no evidence that refutes alternative...

Iverson, Richard M.
Iverson, R.M., 2016, Comment on “The reduction of friction in long-runout landslides as an emergent phenomenon” by Brandon C. Johnson, Charles S. Campbell, and H. Jay Melosh. Journal of Geophysical Research-Earth Surface, 121, 2238–2242, doi:10.1002/2016JF003979

Year Published: 2016

Modelling landslide liquefaction, mobility bifurcation and the dynamics of the 2014 Oso disaster

Some landslides move slowly or intermittently downslope, but others liquefy during the early stages of motion, leading to runaway acceleration and high-speed runout across low-relief terrain. Mechanisms responsible for this disparate behaviour are represented in a two-phase, depth-integrated, landslide dynamics model that melds principles from...

Iverson, Richard M.; George, David L.
Iverson, R.M., and George, D.L., 2016, Modeling landslide liquefaction, mobility bifurcation and the dynamics of the 2014 Oso disaster. Geotechnique, 66, 175–187, doi: 10.1680/jgeot.15.LM.004.

Year Published: 2016

2016 Eastern Section SSA Annual Meeting Report

Report on the Eastern Section Seismological Society of America Meeting.

Pratt, Thomas L.; Goulet, Christine A.; Boyd, Oliver S.
Pratt, T., Goulet, C., and Boyd, O., 2016, 2016 Eastern Section SSA Annual Meeting Report, Seismological Research Letters, v. 88, p. 224-262. DOI: 10.1785/0220160205

Year Published: 2016

Comparing orbiter and rover image-based mapping of an ancient sedimentary environment, Aeolis Palus, Gale crater, Mars

This study provides the first systematic comparison of orbital facies maps with detailed ground-based geology observations from the Mars Science Laboratory (MSL) Curiosity rover to examine the validity of geologic interpretations derived from orbital image data. Orbital facies maps were constructed for the Darwin, Cooperstown, and Kimberley...

Stack, Kathryn M.; Edwards, Christopher; Grotzinger, J. P.; Gupta, S.; Sumner, D.; Edgar, Lauren; Fraeman, A.; Jacob, S.; LeDeit, L.; Lewis, K.W.; Rice, M.S.; Rubin, D.; Calef, F.; Edgett, K.; Williams, R.M.E.; Williford, K.H.
K.M. Stack et al., Comparing orbiter and rover image-based mapping of an ancient sedimentary environment, Aeolis Palus, Gale crater, Mars, Icarus (2016), http://dx.doi.org/10.1016/j.icarus.2016.02.024

Year Published: 2016

Barrier island breach evolution: Alongshore transport and bay-ocean pressure gradient interactions

Physical processes controlling repeated openings and closures of a barrier island breach between a bay and the open ocean are studied using aerial photographs and atmospheric and hydrodynamic observations. The breach site is located on Pea Island along the Outer Banks, separating Pamlico Sound from the Atlantic Ocean. Wind direction was a major...

Safak, Ilgar; Warner, John C.; List, Jeffrey H.
Safak, I., J. C. Warner, and J. H. List (2016), Barrier island breach evolution: Alongshore transport and bay-ocean pressure gradient interactions, J. Geophys. Res. Oceans, 121, doi:10.1002/2016JC012029.

Filter Total Items: 2,698
Summit explosion from webcam
May 24, 2018

Kīlauea Volcano — Summit Plume Rising

Poor weather at the summit of Kīlauea has obscured views of Halema‘uma‘u for much of today, but a brief break in the weather around noon allowed HVO's webcam to capture this image of an ash plume rising from the crater at 12:17 p.m. HST. Even though weather has obscured visual observations of the ongoing summit explosions, HVO scientists are able to track them using

...
May 23, 2018

USGS Status Update of Kīlauea Volcano - May 23, 2018

USGS Hawaiian Volcano Observatory status of Kilauea volcano in Hawaii on May 22, 2018.

Aerial of lava channels feeding ocean entries
May 23, 2018

Kīlauea Volcano — Lava Channels Entering Sea

On May 23, 2018, the Hilo Civil Air Patrol captured this evening photograph of the coastline where lava flows are entering the sea. There are currently three primary ocean entry points, which have evolved over the course of the eruption.

Aerial of lava channels feeding ocean entries
May 23, 2018

Kīlauea Volcano — Lava Channels Feeding Ocean Entries

On Wednesday, May 23, the Hilo Civil Air Patrol conducted flights over the lower East Rift Zone eruption to assist USGS and Hawai‘i County Civil Defense Agency as they respond to the Kīlauea eruption. This image shows the scale of the lava channels feeding the ocean entries. Note that lava is overflowing the channels and is on top of slightly older, black lava flows. The

...
May 23, 2018

Kīlauea Volcano — Overflight of Lower East Rift Zone

Helicopter overflight of lower East Rift Zone ocean entry and fissure complex on May 23, 2018, around 8:00 AM HST.

Vegetation in foreground up on a beach bluff above flat beach with waves.
May 23, 2018

Sunset State Beach Video Camera 1 bright image

Two video cameras overlook the coast at Sunset State Beach in Watsonville, California. Camera 1 looks northwest while Camera 2 looks north. Every half hour during daylight hours, the cameras collect snapshots and video for 10 minutes. The various imagery collected:

  • Snapshot: first frame of the video, just like a standard photo
  • Timex (time-exposure):
...
Plume rising from crater
May 23, 2018

Kīlauea Volcano — Plume from Summit

Multiple explosions at Kīlauea's summit occurred throughout today, with some of the ash plumes rising 6,000 to 7,000 feet above sea level. HVO scientists keeping tabs

...
Vegetation in foreground up on a beach bluff above flat beach with waves.
May 23, 2018

Sunset State Beach Video Camera 1 dark image

Two video cameras overlook the coast at Sunset State Beach in Watsonville, California. Camera 1 looks northwest while Camera 2 looks north. Every half hour during daylight hours, the cameras collect snapshots and video for 10 minutes. The various imagery collected:

  • Snapshot: first frame of the video, just like a standard photo
  • Timex (time-exposure):
...
Coastal flowers in foreground up on a beach bluff above flat beach with waves gently lapping, sky is cloudy in the distance.
May 23, 2018

Sunset State Beach Video Camera 1 Snapshot

Image from video camera overlook the coast at Sunset State Beach in Watsonville, CA. Every half hour during daylight hours, the camera shoots video for 10 minutes. This snapshot is the first frame in the 10-minute sequence.

Telephoto view of plume rising from crater
May 23, 2018

Kīlauea Volcano — Plume from Summit (telephoto)

Multiple explosions at Kīlauea's summit occurred throughout today, with some of the ash plumes rising 6,000 to 7,000 feet above sea level. HVO scientists keeping tabs

...
Vegetation in foreground up on a beach bluff above flat beach with waves.
May 23, 2018

Sunset State Beach Video Camera 1 snapshot

Two video cameras overlook the coast at Sunset State Beach in Watsonville, California. Camera 1 looks northwest while Camera 2 looks north. Every half hour during daylight hours, the cameras collect snapshots and video for 10 minutes. The various imagery collected:

  • Snapshot: first frame of the video, just like a standard photo
  • Timex (time-exposure):
...
Filter Total Items: 407
Date published: October 28, 2010

Earthquake Sensors Available to a Good Home

PASADENA, Calif. – The agency responsible for earthquake monitoring across the United States is looking for 35 volunteers in Southern California to host an earthquake sensor in their home.

Attribution: Natural Hazards
Date published: October 17, 2010

Haiti Earthquake Shaking Amplified by Local Landforms

PORT-AU-PRINCE, Haiti — The severe damage and loss-of-life caused by the devastating January 2010 M7.0 earthquake in Haiti was exacerbated by amplification of shaking due to local geological conditions and landforms in Port-au-Prince, according to a study published online today in Nature Geoscience.

Attribution: Natural Hazards
Date published: October 10, 2010

Unraveling Complexity of Haiti Quake Reveals Hidden Faults and Future Hazards

The January 2010 M7.0 earthquake that devastated Haiti’s economy and caused over 200,000 casualties also resulted in significant uplift of the ground surface along Haiti’s coastline, and involved slip on multiple faults, according to a study published online in Nature Geoscience.

Attribution: Natural Hazards
Date published: October 1, 2010

Global Consortium of Space Agencies to Meet at USGS

The U.S. Geological Survey will host the 24th Secretariat and Board meetings of the International Charter for Space and Major Disasters in Washington, D.C. on October 4-7, 2010.

Date published: September 29, 2010

Global Earthquake Alerts to Include Economic Loss and Casualty Information

Estimated economic loss and casualty information will now be included in earthquake alerts sent out by the U.S. Geological Survey (USGS) following significant earthquakes around the world. 

Attribution: Natural Hazards
Date published: September 28, 2010

Volcanic activity in Arabian Desert makes Case for Increased Monitoring

VANCOUVER, Wash. – Underground magma movement was the trigger of a swarm of 30,000 earthquakes in Saudi Arabia last year, according to a new study published in Nature Geoscience Sunday.

Attribution: Natural Hazards
Date published: August 25, 2010

An island’s rebirth: Life emerges after a catastrophic volcanic eruption

Anchorage, Alaska — A secluded island in the Aleutian chain is revealing secrets of how land and marine ecosystems react to and recover from a catastrophic volcanic eruption that appeared at first glance to destroy all life on the island.

Attribution: Natural Hazards
Date published: May 25, 2007

Media Advisory: USGS and Government of Afghanistan to Unveil Earthquake Hazards Assessment of Afghanistan

WASHINGTON, D.C. - On May 30, the Embassy of Afghanistan will host U.S. Geological Survey (USGS) officials as they unveil an earthquake hazards assessment of the Islamic Republic of Afghanistan.

Attribution: Natural Hazards
Date published: September 14, 2005

USGS Reports New Wetland Loss from Hurricane Katrina in Southeastern Louisiana

U.S. Geological Survey scientists report that preliminary analysis of satellite data indicate Hurricane Katrina caused substantial marsh loss in St. Bernard and Plaquemines parishes.

Attribution: Natural Hazards