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Borehole observations of continuous strain and fluid pressure: Chapter 9

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Abstract

Strain is expansion, contraction, or distortion of the volcanic edifice and surrounding crust. As a result of magma movement, volcanoes may undergo enormous strain prior to and during eruption. Global Positioning System (GPS) observations can in principle be used to determine strain by taking the difference between two nearby observations and dividing by the distance between them. Two GPS stations 1 km apart, each providing displacement information accurate to the nearest millimeter, could detect strain as small as 2 mm km-1, or 2 × 10-6. It is possible, however, to measure strains at least three orders of magnitude smaller using borehole strainmeters. In fact, it is even possible to measure strains as small as 10-8 using observations of groundwater levels in boreholes.

Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title Borehole observations of continuous strain and fluid pressure: Chapter 9
Chapter 9
ISBN 9783642517631
Year Published 2007
Language English
Publisher Springer Link
Publisher location Berlin, Germany
Contributing office(s) Volcano Hazards Program
Description 18 p.
Larger Work Type Book
Larger Work Subtype Monograph
Larger Work Title Volcano Deformation
First page 305
Last page 322
Online Only (Y/N) N
Additional Online Files (Y/N) N