elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Compound dislocation models (CDMs) for volcano deformation analyses

Nikkhoo, Mehdi and Walter, Thomas R. and Lundgren, Paul R. and Prats, Pau (2017) Compound dislocation models (CDMs) for volcano deformation analyses. Geophysical Journal International, 208 (2), pp. 877-894. Oxford University Press. DOI: 10.1093/gji/ggw427 ISSN 0956-540X

Full text not available from this repository.

Official URL: http://gji.oxfordjournals.org/content/early/2016/11/10/gji.ggw427.abstract

Abstract

Volcanic crises are often preceded and accompanied by volcano deformation caused by magmatic and hydrothermal processes. Fast and efficient model identification and parameter estimation techniques for various sources of deformation are crucial for process understanding, volcano hazard assessment and early warning purposes. As a simple model that can be a basis for rapid inversion techniques, we present a compound dislocation model (CDM) that is composed of three mutually orthogonal rectangular dislocations (RDs). We present new RD solutions, which are free of artefact singularities and that also possess full rotational degrees of freedom. The CDM can represent both planar intrusions in the near field and volumetric sources of inflation and deflation in the far field. Therefore, this source model can be applied to shallow dikes and sills, as well as to deep planar and equidimensional sources of any geometry, including oblate, prolate and other triaxial ellipsoidal shapes. In either case the sources may possess any arbitrary orientation in space. After systematically evaluating the CDM, we apply it to the co-eruptive displacements of the 2015 Calbuco eruption observed by the Sentinel-1A satellite in both ascending and descending orbits. The results show that the deformation source is a deflating vertical lens-shaped source at an approximate depth of 8 km centred beneath Calbuco volcano. The parameters of the optimal source model clearly show that it is signicantly different from an isotropic point source or a single dislocation model. The Calbuco example reflects the convenience of using the CDM for a rapid inter- pretation of deformation data.

Item URL in elib:https://elib.dlr.de/107885/
Document Type:Article
Title:Compound dislocation models (CDMs) for volcano deformation analyses
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Nikkhoo, MehdiGFZUNSPECIFIED
Walter, Thomas R.GFZUNSPECIFIED
Lundgren, Paul R.JPLUNSPECIFIED
Prats, PauUNSPECIFIEDUNSPECIFIED
Date:1 February 2017
Journal or Publication Title:Geophysical Journal International
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:208
DOI :10.1093/gji/ggw427
Page Range:pp. 877-894
Publisher:Oxford University Press
Series Name:Geophysical Journal International
ISSN:0956-540X
Status:Published
Keywords:Rectangular dislocations, Compound dislocation models, Volcano deformation modelling
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Flugzeug-SAR
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
Microwaves and Radar Institute > SAR Technology
Deposited By: Prats, Dr. Pau
Deposited On:16 Nov 2016 11:14
Last Modified:06 Sep 2019 15:20

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.