Complementary Methods for Volcanic Seismic Source Discrimination

San Francisco, California, USA

ABSTRACT FINAL ID: V53E-2673
TITLE: Complementary Methods for Volcanic Seismic Source Discrimination
SESSION TYPE: Poster
SESSION TITLE: V53E. Surveillance of Volcanic Unrest: New Developments in Multidisciplinary Monitoring Methods IV Posters

AUTHORS (FIRST NAME, LAST NAME): Charlotte A Rowe1, Susanna M R Falsaperla2, Emily Morton3, Horst K Langer2, Boris Behncke2
INSTITUTIONS (ALL): 1. Los Alamos Natl Lab, Los Alamos, NM, United States.
2. Istituto Nazionale di Geofisica e Volcanologia, Catania, Italy.
3. Earth and Environmental Sciences, New Mexico Institute of Mining and Technology, Socorro, NM, United States.

Title of Team:
ABSTRACT BODY: We explore the success rates of detection and classification algorithms as applied to seismic signals from active volcanoes. The subspace detection method has shown some success in identifying repeating (but not identical) signals from seismic swarm sources, as well as pulling out nonvolcanic long period events within subduction zone tremor. We continue the exploration of this technique as applied to both discrete events and variations within volcanic tremor to determine optimal situations for its use.

We will demonstrate both three-dimensional and subband applications both on raw waveforms and derived features such as skewness and kurtosis. The application can be used in both a supervised (select templates and compare) as well as unsupervised (cross-compare all samples and apply clustering to the matrix of comparisons).

We compare the method to that of the KKAnalysis tool, which uses a self-organizing map approach to unsupervised clustering for feature vectors derived from the seismic waveforms. We will present a comparison of this method as applied to waveform features, spectral features and time-varying higher-order statistics as well as signal polarization, to elucidate the tools which show the best promise for problematic discrimination tasks.