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Andrew Best Lockhart (Former Employee)

Science and Products

USGS and INGEOMINAS colleagues at an lahar-detection (Acoustic Flow...
USGS and INGEOMINAS colleagues at an lahar-detection (Acoustic Flow...
USGS and INGEOMINAS colleagues at an lahar-detection (Acoustic Flow...
USGS and INGEOMINAS colleagues at an lahar-detection (Acoustic Flow...

USGS and INGEOMINAS colleagues at an lahar-detection (Acoustic Flow...

USGS and INGEOMINAS colleagues at an lahar-detection (Acoustic Flow...

USGS and INGEOMINAS colleagues at an lahar-detection (Acoustic Flow Monitor or AFM) station on the west flank of Nevado del Ruiz, Colombia. View is up the glacial valley toward the summit area.

By
Natural Hazards, Volcano Hazards
USGS and INGEOMINAS colleagues at an lahar-detection (Acoustic Flow...

USGS and INGEOMINAS colleagues at an lahar-detection (Acoustic Flow...

USGS and INGEOMINAS colleagues at an lahar-detection (Acoustic Flow...

USGS and INGEOMINAS colleagues at an lahar-detection (Acoustic Flow Monitor or AFM) station on the west flank of Nevado del Ruiz, Colombia. View is up the glacial valley toward the summit area.

By
Natural Hazards, Volcano Hazards

Seismometer records of ground tilt induced by debris flows

A change in surface loading causes the Earth’s surface to deform. Mass movements, such as debris flows, can cause a tilt large enough to be recorded by nearby instruments, but the signal is strongly dependent on the mass loading and subsurface parameters. Specifically designed sensors for such measurements (tiltmeters) are cumbersome to install. Alternatively, broadband seismometers record transla
Authors
Michaela Wenner, Kate E. Allstadt, Weston Thelen, Andrew Lockhart, Jacob Hirschberg, Brian W. McArdell, Fabian Walter
By
Natural Hazards Mission Area, Geologic Hazards Science Center

Strengthening local volcano observatories through global collaborations

We consider the future of volcano observatories in a world where new satellite technologies and global data initiatives have greatly expanded over the last two decades. Observatories remain the critical tie between the decision-making authorities and monitoring data. In the coming decade, the global scientific community needs to continue to collaborate in a manner that will strengthen volcano obse
Authors
Jacob B. Lowenstern, John W. Ewert, Andrew Lockhart
By
Volcano Hazards Program, Volcano Science Center

Overcoming barriers to progress in seismic monitoring and characterization of debris flows and lahars

Debris flows generate seismic signals that contain valuable information about events as they unfold. Though seismic waves have been used for along-channel debris-flow and lahar monitoring systems for decades, it has proven difficult to move beyond detection to more quantitative characterizations of flow parameters and event size. This is for two primary reasons: (1) our limited understanding of ho
Authors
Kate E. Allstadt, Maxime Farin, Andrew Lockhart, Sara McBride, Jason W. Kean, Richard M. Iverson, Matthew Logan, Joel B. Smith, Victor C. Tsai, David L. George
By
Natural Hazards Mission Area, Geologic Hazards Science Center

Seismic and acoustic signatures of surficial mass movements at volcanoes

Surficial mass movements, such as debris avalanches, rock falls, lahars, pyroclastic flows, and outburst floods, are a dominant hazard at many volcanoes worldwide. Understanding these processes, cataloging their spatio-temporal occurrence, and detecting, tracking, and characterizing these events would advance the science of volcano monitoring and help mitigate hazards. Seismic and acoustic methods
Authors
Kate E. Allstadt, Robin S Matoza, Andrew Lockhart, Seth C. Moran, Jacqueline Caplan-Auerbach, Matthew M. Haney, Weston Thelen, Stephen D. Malone
By
Natural Hazards Mission Area, Earthquake Hazards Program, Landslide Hazards Program, Volcano Hazards Program, Geologic Hazards Science Center

Science and Products