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2012gl055043fs01.jpgJPEG image7863KResidual time series of the three components of the 20 sites in the Long Valley Caldera. Secular rates and annual and semi-annual terms were estimated with data before January 2011 and removed from the raw time series. TPO used these residual time series. The vertical lines indicate the approximate onset of the recent inflation event that can be clearly seen from the time series. Note that the amplitude of the vertical component is down-scaled by three.
2012gl055043fs02.pngPNG image405K(a) TPO time series from the calculated velocity field without P630, P631, and P642 (gray dots) and with those sites (black). (b) Chi-squares per degrees-of-freedom without (gray dots) and with (black) the three sites. (c) Differences between the two time series (black-gray) shown in Figure S2a. (d) Ratios of the chi-square values (black/gray) shown in Figure S2b. The TPO time series with the three anomalous sites has a linear component and fast variation during summer shown in Figure S2c. The values of chi-squares increased on average by a factor of 2 for 2007–2008 and 2011.5–2012.2 due to the linear trend.
2012gl055043fs03.jpgJPEG image2052K(a) Horizontal and (b) vertical observed velocities (black vectors) from USGS GPS data and calculated velocities (gray vectors) from a Mogi model. (c) Horizontal and (d) vertical residuals between observed and calculated velocities. Black stars indicate the horizontal location of the source. As shown in Figure S3c, most of misfits are from those sites in the southern part of the caldera, which may indicate biases on velocity estimation due to time-dependent annual variations at those sites. Uncertainties of velocity estimates are omitted for clarity.
2012gl055043fs04.jpgJPEG image1439K(a) Map of Long Valley Caldera M=1.2 seismicity occurring from January 2007 to September 2012 from the Northern California Earthquake Data Center catalog, with GPS sites shown for reference. (b) Earthquake magnitudes and occurrence times. (c) Cumulative number of earthquakes over time observed (black) and predicted by an ETAS model fit to the catalog (red). Small seismicity anomalies in 2007 and 2010 are due to short earthquake swarms. No significant deviation from the model appears in late 2011.
2012gl055043ts01.docxWord 2007 document17KObserved velocities associated with the recent inflation from data after 2011.75a
2012gl055043readme.txtplain text document3KSupporting Information
2012gl055043ts01.txtplain text document3KSupporting Information

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