Sonia Ellison (Former Employee)
Science and Products
Earthquake-Triggered Ground Failure associated with the M9.2 1964 Great Alaska Earthquake Earthquake-Triggered Ground Failure associated with the M9.2 1964 Great Alaska Earthquake
The M9.2 1964 Great Alaska earthquake is the second-largest earthquake in the historical record, the largest in North America, and involved nearly five minutes of shaking (Brocher and others, 2014). The earthquake initiated in the Alaska-Aleutian subduction zone, about 12 km below northern Prince William Sound. The rupture length was about 700 km and generated deep and shallow...
Preliminary Landslide Inventory for Landslides Triggered by Hurricane Helene (September 2024) Preliminary Landslide Inventory for Landslides Triggered by Hurricane Helene (September 2024)
We present a preliminary point inventory of landslides triggered by Hurricane Helene, which impacted southern Appalachia between September 25 and 27, 2024. This inventory is a result of a rapid response mapping effort led by the U.S. Geological Survey’s Landslide Assessments, Situational Awareness, and Event Response Research (LASER) project. LASER collaborated with state surveys and...
Rock mass quality and structural geology observations in Prince William Sound, Alaska (2023) Rock mass quality and structural geology observations in Prince William Sound, Alaska (2023)
Multiple subaerial landslides adjacent to Prince William Sound, Alaska (for example, Dai and others, 2020; Higman and others, 2023; Schaefer and others, 2024) pose a threat to the public because of their potential to generate ocean waves (Barnhart and others, 2021, 2022; Dai and others, 2020) that could affect towns and marine activities. One bedrock landslide on the west side of Barry...
Spectral reflectance data of rock and soil in Prince William Sound, Alaska Spectral reflectance data of rock and soil in Prince William Sound, Alaska
An ASD FieldSpec 4 Hi-Res NG Spectroradiometer was used to collect the reflectance properties of soil and rock in Prince William Sound (Figure 1). Reflectance is a property of the material being observed, being the ratio of the amount of light leaving a target to the amount of light striking the target. Reflectance is a unitless value from 0 to 1, where a value of 0 indicates that the...
Spectral reflectance data of rock and soil in southcentral Alaska Spectral reflectance data of rock and soil in southcentral Alaska
An ASD FieldSpec 4 Hi-Res NG Spectroradiometer was used to collect the reflectance properties of soil and rock in southcentral Alaska, USA (Figure 1) around the city of Anchorage (Figure 2) and the Prince William Sound (Figure 3). Reflectance is a property of the material being observed, being the ratio of the amount of light leaving a target to the amount of light striking the target...
Earthquake triggered ground failure associated with the M7.1 2018 southcentral Alaska Earthquake (ver. 2.0, December 2023) Earthquake triggered ground failure associated with the M7.1 2018 southcentral Alaska Earthquake (ver. 2.0, December 2023)
The November 30, 2018, magnitude (Mw) 7.1 Anchorage, Alaska earthquake triggered substantial ground failure throughout Anchorage and surrounding areas (Grant et al., 2020; Jibson et al., 2020). The earthquake was an intraslab event with a focal depth of about 47 km and an epicenter about 16 km north of the city of Anchorage. Peak ground accelerations reached ∼30% g. Despite the...
Rapid Response Landslide Inventory for the 14 August 2021 M7.2 Nippes, Haiti, Earthquake Rapid Response Landslide Inventory for the 14 August 2021 M7.2 Nippes, Haiti, Earthquake
We present a preliminary point inventory of the landslides associated with the M7.2 Nippes, Haiti, earthquake that occurred on August 14, 2021. The mapping was part of rapid response efforts to identify hazards for situational awareness and emergency response by humanitarian aid organizations. This inventory accompanies an Open-File Report detailing the hazards presented by the...
Earthquake-triggered ground-failure inventory associated with the M7.1 2018 Southcentral Alaska earthquake Earthquake-triggered ground-failure inventory associated with the M7.1 2018 Southcentral Alaska earthquake
The 30 November 2018, magnitude (Mw) 7.1 earthquake in Southcentral Alaska triggered substantial landslides, liquefaction, and ground cracking throughout the region, resulting in widespread geotechnical damage to buildings and infrastructure. Despite a challenging reconnaissance and remote-sensing environment, we constructed a detailed digital inventory of ground failure associated with...
Authors
Sabrina N. Martinez, Kate E. Allstadt, Eric M. Thompson, Sonia Ellison, Lauren N. Schaefer, Kelli Wadsworth Baxstrom
Modern products for a vintage event: An update on the 1933 Long Beach, California, earthquake Modern products for a vintage event: An update on the 1933 Long Beach, California, earthquake
When a notable earthquake occurs in the United States, a range of familiar real‐ and near‐real‐time products are produced by the U.S. Geological Survey (USGS) Advanced National Seismic System (ANSS), and made available via the ANSS Comprehensive Earthquake Catalog. For historical and early instrumental earthquakes, similar results and products are developed depending on data availability...
Authors
Susan E. Hough, J. Luke Blair, Sonia Ellison, Robert Graves, Scott Haefner, Eric M. Thompson, Nicholas van der Elst, Morgan T. Page, David J. Wald
Landslides triggered by the August 14, 2021, magnitude 7.2 Nippes, Haiti, earthquake Landslides triggered by the August 14, 2021, magnitude 7.2 Nippes, Haiti, earthquake
The August 14, 2021, magnitude 7.2 Nippes, Haiti, earthquake triggered thousands of landslides on the Tiburon Peninsula. The landslides directly caused fatalities and damage and impeded response efforts by blocking roads and causing other infrastructure damage. Adverse effects of the landslides likely will continue for months to years. This report presents an assessment of potential...
Authors
Sabrina N. Martinez, Kate E. Allstadt, Stephen L. Slaughter, Robert G. Schmitt, Elaine Collins, Lauren N. Schaefer, Sonia Ellison
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Earthquake-Triggered Ground Failure associated with the M9.2 1964 Great Alaska Earthquake Earthquake-Triggered Ground Failure associated with the M9.2 1964 Great Alaska Earthquake
The M9.2 1964 Great Alaska earthquake is the second-largest earthquake in the historical record, the largest in North America, and involved nearly five minutes of shaking (Brocher and others, 2014). The earthquake initiated in the Alaska-Aleutian subduction zone, about 12 km below northern Prince William Sound. The rupture length was about 700 km and generated deep and shallow...
Preliminary Landslide Inventory for Landslides Triggered by Hurricane Helene (September 2024) Preliminary Landslide Inventory for Landslides Triggered by Hurricane Helene (September 2024)
We present a preliminary point inventory of landslides triggered by Hurricane Helene, which impacted southern Appalachia between September 25 and 27, 2024. This inventory is a result of a rapid response mapping effort led by the U.S. Geological Survey’s Landslide Assessments, Situational Awareness, and Event Response Research (LASER) project. LASER collaborated with state surveys and...
Rock mass quality and structural geology observations in Prince William Sound, Alaska (2023) Rock mass quality and structural geology observations in Prince William Sound, Alaska (2023)
Multiple subaerial landslides adjacent to Prince William Sound, Alaska (for example, Dai and others, 2020; Higman and others, 2023; Schaefer and others, 2024) pose a threat to the public because of their potential to generate ocean waves (Barnhart and others, 2021, 2022; Dai and others, 2020) that could affect towns and marine activities. One bedrock landslide on the west side of Barry...
Spectral reflectance data of rock and soil in Prince William Sound, Alaska Spectral reflectance data of rock and soil in Prince William Sound, Alaska
An ASD FieldSpec 4 Hi-Res NG Spectroradiometer was used to collect the reflectance properties of soil and rock in Prince William Sound (Figure 1). Reflectance is a property of the material being observed, being the ratio of the amount of light leaving a target to the amount of light striking the target. Reflectance is a unitless value from 0 to 1, where a value of 0 indicates that the...
Spectral reflectance data of rock and soil in southcentral Alaska Spectral reflectance data of rock and soil in southcentral Alaska
An ASD FieldSpec 4 Hi-Res NG Spectroradiometer was used to collect the reflectance properties of soil and rock in southcentral Alaska, USA (Figure 1) around the city of Anchorage (Figure 2) and the Prince William Sound (Figure 3). Reflectance is a property of the material being observed, being the ratio of the amount of light leaving a target to the amount of light striking the target...
Earthquake triggered ground failure associated with the M7.1 2018 southcentral Alaska Earthquake (ver. 2.0, December 2023) Earthquake triggered ground failure associated with the M7.1 2018 southcentral Alaska Earthquake (ver. 2.0, December 2023)
The November 30, 2018, magnitude (Mw) 7.1 Anchorage, Alaska earthquake triggered substantial ground failure throughout Anchorage and surrounding areas (Grant et al., 2020; Jibson et al., 2020). The earthquake was an intraslab event with a focal depth of about 47 km and an epicenter about 16 km north of the city of Anchorage. Peak ground accelerations reached ∼30% g. Despite the...
Rapid Response Landslide Inventory for the 14 August 2021 M7.2 Nippes, Haiti, Earthquake Rapid Response Landslide Inventory for the 14 August 2021 M7.2 Nippes, Haiti, Earthquake
We present a preliminary point inventory of the landslides associated with the M7.2 Nippes, Haiti, earthquake that occurred on August 14, 2021. The mapping was part of rapid response efforts to identify hazards for situational awareness and emergency response by humanitarian aid organizations. This inventory accompanies an Open-File Report detailing the hazards presented by the...
Earthquake-triggered ground-failure inventory associated with the M7.1 2018 Southcentral Alaska earthquake Earthquake-triggered ground-failure inventory associated with the M7.1 2018 Southcentral Alaska earthquake
The 30 November 2018, magnitude (Mw) 7.1 earthquake in Southcentral Alaska triggered substantial landslides, liquefaction, and ground cracking throughout the region, resulting in widespread geotechnical damage to buildings and infrastructure. Despite a challenging reconnaissance and remote-sensing environment, we constructed a detailed digital inventory of ground failure associated with...
Authors
Sabrina N. Martinez, Kate E. Allstadt, Eric M. Thompson, Sonia Ellison, Lauren N. Schaefer, Kelli Wadsworth Baxstrom
Modern products for a vintage event: An update on the 1933 Long Beach, California, earthquake Modern products for a vintage event: An update on the 1933 Long Beach, California, earthquake
When a notable earthquake occurs in the United States, a range of familiar real‐ and near‐real‐time products are produced by the U.S. Geological Survey (USGS) Advanced National Seismic System (ANSS), and made available via the ANSS Comprehensive Earthquake Catalog. For historical and early instrumental earthquakes, similar results and products are developed depending on data availability...
Authors
Susan E. Hough, J. Luke Blair, Sonia Ellison, Robert Graves, Scott Haefner, Eric M. Thompson, Nicholas van der Elst, Morgan T. Page, David J. Wald
Landslides triggered by the August 14, 2021, magnitude 7.2 Nippes, Haiti, earthquake Landslides triggered by the August 14, 2021, magnitude 7.2 Nippes, Haiti, earthquake
The August 14, 2021, magnitude 7.2 Nippes, Haiti, earthquake triggered thousands of landslides on the Tiburon Peninsula. The landslides directly caused fatalities and damage and impeded response efforts by blocking roads and causing other infrastructure damage. Adverse effects of the landslides likely will continue for months to years. This report presents an assessment of potential...
Authors
Sabrina N. Martinez, Kate E. Allstadt, Stephen L. Slaughter, Robert G. Schmitt, Elaine Collins, Lauren N. Schaefer, Sonia Ellison
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.