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Geologic Hazards Science Center images.
Aftershock Forecast Sequence-Specific Model Parameters equation
The probability distribution for the number of aftershocks, P(N), and the forecast can then be computed using the same procedures as for the generic model, using Pseq-spec(a) instead of Pgeneric(a).
Aftershock Forecast Sequence-Specific Model Parameters equation
The probability distribution for the number of aftershocks, P(N), and the forecast can then be computed using the same procedures as for the generic model, using Pseq-spec(a) instead of Pgeneric(a).
An example of Bayesian updating of productivity parameter (a-value) for the 2010 Mw 8.8 Maule, Chile, earthquake. Immediately following the earthquake, the SZ-GENERIC region-specific a-value distribution can be used.
An example of Bayesian updating of productivity parameter (a-value) for the 2010 Mw 8.8 Maule, Chile, earthquake. Immediately following the earthquake, the SZ-GENERIC region-specific a-value distribution can be used.
Screenshot of the Aftershock Forecast for an earthquake in California, showing the information box at the top of the forecast and the four tabs of forecast information.
Screenshot of the Aftershock Forecast for an earthquake in California, showing the information box at the top of the forecast and the four tabs of forecast information.
Screenshot of the Aftershock Forecast for an earthquake in California, with the “Summary” tab selected, and “M4+” and “Show All” selections for magnitude and forecast duration.
Screenshot of the Aftershock Forecast for an earthquake in California, with the “Summary” tab selected, and “M4+” and “Show All” selections for magnitude and forecast duration.
Screenshot of the Aftershock Forecast for an earthquake in California, with the “Summary” tab selected, and “M4+” and “Show All” selections for magnitude and forecast duration.
Screenshot of the Aftershock Forecast for an earthquake in California, with the “Summary” tab selected, and “M4+” and “Show All” selections for magnitude and forecast duration.
Screenshot of the Aftershock Forecast for an earthquake in California, with the “Forecast Table” tab selected.
Screenshot of the Aftershock Forecast for an earthquake in California, with the “Forecast Table” tab selected.
Screenshot of the Overview webpage for an earthquake in California. The “Aftershock Forecast” card is at lower center.
Screenshot of the Overview webpage for an earthquake in California. The “Aftershock Forecast” card is at lower center.
Screenshot of the Aftershock Forecast for an earthquake in California, with the “Summary” tab selected, and “Show All” and “1 Month” selections for magnitude and forecast duration.
Screenshot of the Aftershock Forecast for an earthquake in California, with the “Summary” tab selected, and “Show All” and “1 Month” selections for magnitude and forecast duration.
LANDSLIDE SAFETY
If your home or property was damaged by a landslide from Hurricane Helene, be aware of the warning signs of future landslide activity
WATCH FOR WARNING SIGNS
Signs a landslide may be moving include:
LANDSLIDE SAFETY
If your home or property was damaged by a landslide from Hurricane Helene, be aware of the warning signs of future landslide activity
WATCH FOR WARNING SIGNS
Signs a landslide may be moving include:
(a) Photograph of instruments being tested in the East portion of the underground vault. (b) Wench and location of three boreholes in the West portion of the underground vault. (c) Cross-tunnel and recording equipment for the reference sensor vault.
(a) Photograph of instruments being tested in the East portion of the underground vault. (b) Wench and location of three boreholes in the West portion of the underground vault. (c) Cross-tunnel and recording equipment for the reference sensor vault.
Arial view from the North of the Albuquerque Seismological Laboratory on the Kirtland Air Force Base about 15 miles southeast of Albuquerque, New Mexico.
Arial view from the North of the Albuquerque Seismological Laboratory on the Kirtland Air Force Base about 15 miles southeast of Albuquerque, New Mexico.
Locations of the Global Seismographic Network (GSN) stations. USGS GSN sites are shown as pink circles and IRIS/IDA stations are shown as green circles. (as of October 2024)
Locations of the Global Seismographic Network (GSN) stations. USGS GSN sites are shown as pink circles and IRIS/IDA stations are shown as green circles. (as of October 2024)
Coordinates of photographer: Latitude: 35° 33’ 21.75” N, Longitude: 82° 19’ 0.9” W
Date: 10/17/24
Caption: Damage caused by mudflows into Flat Creek near the Garren Creek Fire Station. Some of the initiating landslides are visible in the distance, upper left of photo.
Taken during Hurricane Helene LASER response
Coordinates of photographer: Latitude: 35° 33’ 21.75” N, Longitude: 82° 19’ 0.9” W
Date: 10/17/24
Caption: Damage caused by mudflows into Flat Creek near the Garren Creek Fire Station. Some of the initiating landslides are visible in the distance, upper left of photo.
Taken during Hurricane Helene LASER response
Coordinates of photographer: Latitude: 35° 44’ 16.08” N Longitude: 82° 8’ 20.04” W
Date: 10/17/24
Caption: Damage caused by a large mudflow in Buck Creek near Marion, NC.
Taken during Hurricane Helene LASER response
Coordinates of photographer: Latitude: 35° 44’ 16.08” N Longitude: 82° 8’ 20.04” W
Date: 10/17/24
Caption: Damage caused by a large mudflow in Buck Creek near Marion, NC.
Taken during Hurricane Helene LASER response
Coordinates of photographer: Latitude: 36° 15’ 31.74” N Longitude: 81° 44’ 32.952” W
Date 10/13/24
Caption: A landslide near Vilas, NC.
Taken as part of Hurricane Helene LASER response
Coordinates of photographer: Latitude: 36° 15’ 31.74” N Longitude: 81° 44’ 32.952” W
Date 10/13/24
Caption: A landslide near Vilas, NC.
Taken as part of Hurricane Helene LASER response
Coordinates of photographer: Latitude: 35° 27’ 42.48” N Longitude: 82° 16’ 57.75” W
Date: 10/13/24
Caption: Multiple landslides and mudflows in Bat Cave, NC
Taken during Hurricane Helene LASER response
Coordinates of photographer: Latitude: 35° 27’ 42.48” N Longitude: 82° 16’ 57.75” W
Date: 10/13/24
Caption: Multiple landslides and mudflows in Bat Cave, NC
Taken during Hurricane Helene LASER response
Coordinates of photographer: Latitude: 36° 19’ 56.508” N Longitude: 81° 44’ 56.148” W
Date: 10/13/24
Caption: Landslide and flood damage near Zionville, NC.
Taken during Hurricane Helene LASER response
Coordinates of photographer: Latitude: 36° 19’ 56.508” N Longitude: 81° 44’ 56.148” W
Date: 10/13/24
Caption: Landslide and flood damage near Zionville, NC.
Taken during Hurricane Helene LASER response
The Landslide Observation Dashboard, a multi-agency effort to map where landslides have occurred in the southern Appalachian Mountains, launched September 30, 2024, as a “timely best science” provisional interface that can be used by the general public and local authorities as they prioritize resources.
The Landslide Observation Dashboard, a multi-agency effort to map where landslides have occurred in the southern Appalachian Mountains, launched September 30, 2024, as a “timely best science” provisional interface that can be used by the general public and local authorities as they prioritize resources.
U.S. Geological Survey landslide experts conduct an aerial reconnaissance flight October 3, 2024, over the southern Appalachian Mountains to get a better understanding of the extent and severity of landslide impacts in the wake of Hurricane Helene, which brought widespread flooding and destruction. (USGS photo by Ben Mirus).
U.S. Geological Survey landslide experts conduct an aerial reconnaissance flight October 3, 2024, over the southern Appalachian Mountains to get a better understanding of the extent and severity of landslide impacts in the wake of Hurricane Helene, which brought widespread flooding and destruction. (USGS photo by Ben Mirus).
NATIONAL LANDSLIDE SUSCEPTIBILITY MAP
POSTFIRE DEBRIS FLOW SCIENCE
The U.S. Geological Survey helps local, state, and federal agencies assess debris flow hazards in recently burned areas. We provide information about the likelihood of debris flow activity, where they might happen, and how big they might be.
DEBRIS FLOW ASSESSMENTS
POSTFIRE DEBRIS FLOW SCIENCE
The U.S. Geological Survey helps local, state, and federal agencies assess debris flow hazards in recently burned areas. We provide information about the likelihood of debris flow activity, where they might happen, and how big they might be.
DEBRIS FLOW ASSESSMENTS