Contents of this file Introduction

[Geophysical Research Letters] Supporting Information for [Temporal Variation in the Magnitude-Frequency Distribution during the GuyGreenbrier Earthquake Sequence] [Yihe Huang, Gregory C. Beroza] [Stanford Center for Induced and Triggered Seismicity, 397 Panama Mall, Stanford, CA 94305]

Contents of this file Table S1 Figures S1 to S9

Introduction The supporting information includes one table and eight figures: Table S1 compares the number of catalog events and detections from our single-station template matching. The magnitude of completeness for each month is also shown in the table. Figure S1 shows the distribution of cross-correlation coefficients for an hour of seismic data given a certain template. Figure S2 compares the WHAR velocity seismograms and the corresponding Wood-Anderson seismograms for five earthquakes in October 2010. The benchmark between the WHAR magnitudes and the Wood-Anderson magnitudes of earthquakes in October 2010 and February 2011 are shown in Figure S3. Figure S4 shows the monthly injection moments, volumes and pressures of well #1 and #5, and the seismicity rate between July 2010 and October 2011. Figure S5 demonstrates how the magnitude of completeness is determined from the smallest misfit between the observed and synthetic MFD. Figure S6 compares the maximum-likelihood and robust-fit estimates of b-values, and Figure S7 compares the maximum-likelihood estimates of b-values given different distributions. Figure S8 shows the maximum-likelihood estimates of truncated magnitudes given different distributions. Figure S9 compares the cumulative moment release to the upper bound of seismic moment predicted by monthly injection volume.

Month

Catalog events

Detections

Mc

July 2010 August 2010 September 2010 October 2010 November 2010 December 2010 January 2011 February 2011 March 2011 April 2011 May 2011 June 2011 July 2011 August 2011 September 2011 October 2011

15 24 27 222 209 151 60 214 209 115 27 6 29 3 3 63

16,528 10,432 15,671 122,693 97,264 52,767 14,348 39,100 53,563 11,793 5,459 4,776 3,896 3,442 3,610 7,463

-1.0 -1.1 -1.1 -0.3 -0.2 -1.0 -1.2 -0.2 -0.5 -0.5 -1.1 -1.0 -1.3 -1.3 -1.2 -0.7

Table S1. Numbers of ANSS catalog events, detections and the magnitude of completeness (Mc) in this study for each month.

Figure S1. The distribution of cross-correlation coefficients calculated from crosscorrelating a template with an hour of continuous seismic data. Inset shows the windows with cross-correlation coefficients larger than 8 times the median absolute deviation.

Figure S2. Velocity seismograms of different earthquakes recorded at WHAR (left) and the corresponding Wood-Anderson seismograms (right). The earthquake magnitudes determined from peak velocity and the Wood-Anderson peak displacement are shown on the top of each seismogram. Although crustal corrections would be different than in southern California where the local magnitude was defined, the short propagation distance (