| NSF Org: |
EAR Division Of Earth Sciences |
| Recipient: |
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| Initial Amendment Date: | December 18, 2009 |
| Latest Amendment Date: | June 1, 2011 |
| Award Number: | 0944055 |
| Award Instrument: | Continuing Grant |
| Program Manager: |
Raffaella Montelli
EAR Division Of Earth Sciences GEO Directorate for Geosciences |
| Start Date: | July 1, 2010 |
| End Date: | June 30, 2013 (Estimated) |
| Total Intended Award Amount: | $247,543.00 |
| Total Awarded Amount to Date: | $247,543.00 |
| Funds Obligated to Date: |
FY 2011 = $132,503.00 |
| History of Investigator: |
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| Recipient Sponsored Research Office: |
615 W 131ST ST NEW YORK NY US 10027-7922 (212)854-6851 |
| Sponsor Congressional District: |
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| Primary Place of Performance: |
Rt 9W Palisades NY US 10964 |
| Primary Place of
Performance Congressional District: |
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| Unique Entity Identifier (UEI): |
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| Parent UEI: |
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| NSF Program(s): | Geophysics |
| Primary Program Source: |
01001112DB NSF RESEARCH & RELATED ACTIVIT |
| Program Reference Code(s): |
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| Program Element Code(s): |
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| Award Agency Code: | 4900 |
| Fund Agency Code: | 4900 |
| Assistance Listing Number(s): | 47.050 |
ABSTRACT
The project involves the investigation of anomalous seismic sources with a specific focus on slow earthquakes associated with volcanos and landslides. It builds on results and discoveries that have come from the systematic application of a long-period event detection algorithm to real-time and archive seismic data recorded on the Global Seismographic Network. For each year since 1991, more than 100 earthquakes of magnitude 5 or greater that are not reported in other catalogs have been detected and located using this algorithm. Many of these earthquakes are slow, and a large number of them have been associated with volcanos and landslides. The first goal of the project is to discriminate volcano and landslide earthquakes from other earthquakes that have been identified only by the long-period detection algorithm. The second goal is to relate those earthquakes that occur in volcanic regions to eruptive activity and changes in the geometry and behavior of magmatic plumbing systems. In particular, the project will involve a detailed comparative study of unusual earthquakes associated with the two greatest caldera collapses of basaltic volcanos over the last century, Fernandina (Galapagos Islands) and Miyakejima (Japan). The third goal is to investigate anomalous earthquakes associated with large landslide events. A recently developed methodology for determining the trajectory of the sliding mass during a landslide directly from the radiated seismic waves will be refined and improved and applied to several known and inferred landslide events in order to estimate dynamic landslide parameters.
The project will lead to an improved characterization and discrimination of earthquake sources, and will help clarify the phenomenology of volcano and landslide earthquakes. The volcano investigations will provide new constraints on stress and deformation patterns within active volcanoes, as well as on the mechanics of caldera collapse and its relationship to magmatic transport and plumbing. The landslide investigations will lead to better characterization of the seismic radiation from landslide sources, and will provide new constraints on key landslide parameters, such as mass, runout, and effective coefficient of friction. The seismological analysis methods developed for these studies will contribute to improved monitoring capabilities for volcanos and landslides, which represent important classes of geohazards.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
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PROJECT OUTCOMES REPORT
Disclaimer
This Project Outcomes Report for the General Public is displayed verbatim as submitted by the Principal Investigator (PI) for this award. Any opinions, findings, and conclusions or recommendations expressed in this Report are those of the PI and do not necessarily reflect the views of the National Science Foundation; NSF has not approved or endorsed its content.
This award supported investigations of unusual and anomalous earthquakes that occur near volcanos and in association with large landslides and calving glaciers. The focus of the study was earthquakes of magnitude 5 and larger that are not detected or located by standard agencies such as the USGS, but which cause long-period seismic waves that are globally recorded. The project involved the systematic analysis of such previously unreported earthquakes, and investigations into their mechanisms. The main data source for the research was seismograms recorded on the Global Seismographic Network.
Last Modified: 11/05/2013
Modified by: Goran Ekstrom
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