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Short Communication Characterization of pyroclastic fall and flow deposits

Summary: Short Communication
Characterization of pyroclastic fall and flow deposits
from the 1815 eruption of Tambora volcano,
Indonesia using ground-penetrating radar
Lewis J. Abrams a,, Haraldur Sigurdsson b
University of North Carolina, Center for Marine Science, 5600 Marvin Moss Lane, Wilmington, NC 28409, United States
University of Rhode Island, Graduate School of Oceanography, Narragansett, RI 02882, United States
Received 3 August 2006; received in revised form 16 November 2006; accepted 24 November 2006
Available online 20 February 2007
Ground-penetrating radar (GPR) is used to image and characterize fall and pyroclastic flow deposits from the 1815 eruption of
Tambora volcano in Indonesia. Analysis of GPR common-mid-point (CMP) data indicate that the velocity of radar in the sub-
surface is 0.1 m/ns, and this is used to establish a preliminary traveltime to-depth conversion for common-offset reflection profiles.
Common-offset radar profiles were collected along the edge of an erosional gully that exposed approximately 12 m of volcanic
stratigraphy. Additional trenching at select locations in the gully exposed the contact between the pre-1815 eruption surface and
overlying pyroclastic deposit from the 1815 eruption. The deepest continuous, prominent reflection is shown to correspond to the
interface between pre-eruption clay-rich soil and pyroclastics that reach a maximum thickness of 4 m along our profiles. This soil
surface is distinctly terraced and is interpreted as the ground surface augmented for agriculture and buildings by people from the


Source: Abrams, Lewis J. - Center for Marine Science & Department of Geography and Geology, University of North Carolina at Wilmington


Collections: Geosciences