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Application of MODIS-ASTER (Master) simulator data to geological mapping of young volcanic regions in Baja California, Mexico


Dmochowski, Jane Ellen (2005) Application of MODIS-ASTER (Master) simulator data to geological mapping of young volcanic regions in Baja California, Mexico. Dissertation (Ph.D.), California Institute of Technology.


Visible, near infrared, short-wave infrared, and thermal infrared multi-channel remote sensing data, MODIS-ASTER (MASTER), are used to extract geologic information from two volcanic regions in Baja California, Mexico: Tres Virgenes-La Reforma Volcanic Region and the volcanic island of Isla San Luis. The visible and near infrared and short-wave infrared data were atmospherically corrected and classified. The resulting classification roughly delineates surfaces that vary in their secondary minerals. Attempts to identify these minerals using ENVI's Spectral Analyst(TM) were moderately successful. The analysis of the thermal infrared data utilizes the shift to longer wavelengths in the Reststrahlen band as the mineralogy changes from felsic to mafic to translate the data into values of weight percent SiO2. The results indicate that the general approach tends to underestimate the weight percent SiO2 in the image. This discrepancy is removed with a "site calibration," which provides good results in the calculated weight percent SiO2, with errors of a few percent. However, errors become larger with rugged topography or low solar angle at the time of image acquisition. Analysis of bathymetric data around Isla San Luis, and consideration of the island's alignment with the Ballenas transform fault zone to the south and volcanic seamounts nearby, suggest Isla San Luis is potentially volcanically active and could be the product of a "leaky" transform fault. The results from the image analysis in the Tres Virgenes-La Reforma Volcanic Region show the La Reforma and El Aguajito volcanic centers to be bimodal in composition and verify the most recent volcanism in the Tres Virgenes region to be basaltic-andesite. The results of fieldwork and image analysis indicate that the volcanic products of the central dome of La Reforma are likely a sequence of welded ash flow tuffs and lavas of varied composition, evidence of its origin as a caldera.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Baja California; Isla San Luis; La Reforma; Mexico; remote sensing; volcano; weight percent silica
Degree Grantor:California Institute of Technology
Division:Geological and Planetary Sciences
Major Option:Geophysics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Stock, Joann M. (advisor)
  • Clayton, Robert W. (advisor)
Thesis Committee:
  • Clayton, Robert W. (chair)
  • Avouac, Jean-Philippe
  • Stock, Joann M.
  • Simons, Mark
Defense Date:27 July 2004
Record Number:CaltechETD:etd-05262005-150027
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2096
Deposited By: Imported from ETD-db
Deposited On:26 May 2005
Last Modified:25 Oct 2016 23:46

Thesis Files

PDF (JaneEDmochowskiThesis.pdf) - Final Version
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PDF (Plate1.pdf) - Supplemental Material
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PDF (Plate2.pdf) - Supplemental Material
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