RSQSim Simulated Earthquake Catalog 5091, New Zealand, NSHM2012 Fault System, 276kyr

Earthquake simulator for New Zealand

Simulated earthquake catalog, generated with the Rate-State Earthquake Simulator (RSQSim), described in and used by the following publication:

Bruce E. Shaw, Bill Fry, Andrew Nicol, Andrew Howell, and Matthew Gerstenberger, An Earthquake Simulator for New Zealand, submitted, 2021.

A github repository with python tools to interact with this catalog, and other similar rsqsim catalogs, is located at:

https://github.com/uc-eqgeo/rsqsim-python-tools

This repository is intended to continue to be improved and updated .

Additional references discussing the simulator and its uses:

Kevin R. Milner, Bruce E. Shaw, Christine A. Goulet, Keith B. Richards‐Dinger, Scott Callaghan, Thomas H. Jordan, James H. Dieterich, Edward H. Field; Toward Physics‐Based Nonergodic PSHA: A Prototype Fully Deterministic Seismic Hazard Model for Southern California. Bulletin of the Seismological Society of America 2021;; 111 (2): 898–915. doi: https://doi.org/10.1785/0120200216

Bruce E. Shaw, Kevin R. Milner, Edward H. Field; Keith B. Richards‐Dinger, Jacquelyn J. Gilchrist, James H. Dieterich, and Thomas H. Jordan, 'A physics-based earthquake simulator replicates seismic hazard statistics across California', Science Advances, 4, 2018. doi:10.1126/sciadv.aau0688

The catalog is simulated on a fault system for New Zealand built from source in the NSHM2021 national hazard model, following the hybrid loading technique described in Shaw (2019) (https://doi.org/10.1785/0120180128).

File Descriptions:

The descriptions below are for some of the more relevant files.  There are additional files as well.  The python tools in the github repository interact with additional files not mentioned here. 

Catalog CSV File: catalog.csv

This is a human-readable summary file listing each event (after
skipping the first 50kyrs of model spin-up time).
Each line corresponds to an event in the catalog, and contains the
following information:

  * Event ID and occurrence time
  * Magnitude, Moment, and Area
  * Participating element information (count, average slip, long-term
    average slip rate)
  * Hypocenter and scalar-moment centroid locations
  * Rupture surface minimum and maximum depths

Geometry File (ASCII): zfault_Deepen.in

ASCII file listing patch (triangular) geometry for the simulated faults
in a UTM coordinate system (zone 11S). The primary columns are:

  * /x1, y1, z1/ - UTM coordinates of the first vertex
  * /x2, y2, z2/ - UTM coordinates of the second vertex
  * /x3, y3, z3/ - UTM coordinates of the third vertex
  * /rake/ - Direction of the motion of the hanging wall relative to the
    footwall (in degrees, following the convention of Aki & Richards, 2002)
  * /slip_rate/ - Long-term average slip rate (in m/s)

The first line in the file (excluding comment lines that start with '#')
is the patch with ID=1, the second ID=2, etc. Additional metadata
columns may exist in each line beyond those listed and can be ignored.

Catalog List Files (binary): catalog.eList, catalog.pList,
catalog.tList, catalog.dList

The raw output of RSQSim includes 4 binary "list" files that define the
simulated event IDs, times, and total slip in each participating patch.
All 4 list files should be processed together, as the /N/-th item in one
list file corresponds to the /N/-th item in each other file.

For each patch the ruptures during an event, a value is written to each
of these files giving 1) the patch number, 2) the event number, 3) the
distance slipped during the event, and 4) the time of first rupture for
that patch during that event.

The format is as follows:

  * catalog.eList: list of event IDs (1-based), stored as little-endian
    4-byte integers
  * catalog.pList: list of patch IDs (1-based), stored as little-endian
    4-byte integers
  * catalog.tList: list of time of first slip on each patch in each
    event (in seconds, relative to simulation origin time), stored as
    little-endian 8-byte double precision floating-point numbers
  * catalog.dList: list of total slip on each patch in each event (in
    meters), stored as little-endian 8-byte double precision
    floating-point numbers

RSQSim Input File (ASCII): multiparam.in

Key-value pairs of RSQSim model parameters, used to originally run the
simulation.