|Title||Comparing direct observation of strain, rotation, and displacement with array estimates at Pinon Flat Observatory, California|
|Publication Type||Journal Article|
|Year of Publication||2017|
|Authors||Donner S., Lin C.J, Hadziioannou C., Gebauer A., Vernon F, Agnew DC, Igel H., Schreiber U., Wassermann J.|
|Journal||Seismological Research Letters|
|Type of Article||Article|
|Keywords||dynamic strains; earthquake; ground motions; inversion; obspy; parkfield; ring laser measurements; seismograph; Seismology|
The unique instrument setting at the Pinon Flat Observatory in California is used to simultaneously measure 10 out of the 12 components, completely describing the seismic-wave field. We compare the direct measurements of rotation and strain for the 13 September 2015 M-w 6.7 Gulf of California earthquake with array-derived observations using this configuration for the first time. In general, we find a very good fit between the observations of the two measurements with cross-correlation coefficients up to 0.99. These promising results indicate that the direct and array-derived measurements of rotation and strain are consistent. For the array-based measurement, we derived a relation to estimate the frequency range within which the array-derived observations provide reliable results. This relation depends on the phase velocity of the study area and the calibration error, as well as on the size of the array.