M.J.S. Johnston
S. McHugh
1979
<div id="abstracts" class="Abstracts u-font-serif"><div id="aep-abstract-id4" class="abstract author"><div id="aep-abstract-sec-id5"><div class="u-margin-s-bottom">Tilt changes associated with 1–5 mm of fault creep have been detected at several different locations on the San Andreas fault on tiltmeters within 500 m of the creep observation point. The creep-related tilts have amplitudes of <span>≤ </span>0̌.5 μrad and durations comparable to the creep events. No changes <span>≥</span><span> </span><span id="MathJax-Element-1-Frame" class="MathJax_SVG" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mtext>$</mtext><mtext>&#x306;</mtext></math>"></span>10<sup>−2</sup><span> </span>μrad have been observed on tiltmeters at distances <span>≥</span><span> </span><span id="MathJax-Element-2-Frame" class="MathJax_SVG" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mtext>$</mtext><mtext>&#x306;</mtext></math>"></span>1 km from the fault at the time of the creep events. Dislocation models capable of replicating the creep-related tilt events have been constructed to examine the relationship of the model parameters to details of the tilt waveforms. The tilt time histories and bounded assumptions of the source-station configurations, and the displacement time history, can be used to infer the type and amount of displacement, the propagation direction and depth of the slip zone. The shallow depth and finite size of the slip zone indicated by these models contrasts with the horizontal extent.</div></div></div></div>
application/pdf
10.1016/0040-1951(79)90267-1
en
Elsevier
Dislocation modeling of creep-related tilt changes
article