Chet Hopp edited section_Dataset_label_Dataset_Initial__.tex  over 7 years ago

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\section{Dataset} \label{Dataset}  Initial earthquake catalogs for this study are provided by a group at GNS which is tasked with collecting, and preliminary analysis of, continuous seismic data from the Mercury seismograph networks. The Mercury data are collected roughly every three months directly from the data loggers and are supplemented by data from the aforementioned GeoNet stations. GeoNet data is sampled at 100 Hz while the Mercury network is sampled at 200 Hz. For most of this study, these data were resampled at 50 Hz to lower computational costs.  The initial GNS earthquake catalog events are automatically detected and located by the SeisComP3 software package. As automatic S-phase picking is not implemented, these events were located with P picks only. We filter the catalog to include only events within a 50 km by 50 km bounding box centered on the geothermal fields and filter again for events with an average pick residual within 1 standard deviation of the mean event-averaged pick residual across the dataset. For the 2015 dataset dataset,  which is the only year we currently have catalog data for, this leaves 637 events. The locations for these events are are shown in the context of the seismic network in Figure \ref{Figure1}. Note that the ratio of Rotokawa to Ngatamariki seismicity still holds at 3:1 for the filtered catalog of template events shown. Mercury has provided well locations and pumping rates for injection wells within the Rotokawa and Ngatamariki geothermal fields for the entire study period.