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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
a
University of North Carolina, Center for Marine Science, 5600 Marvin Moss Lane, Wilmington, NC 28409, United States
b
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
Abstract
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