Catalogs to test magnitude dependence

Southern California Earthquake Catalog (1981–2011)

Description-----------This catalog contains relocated earthquake hypocenters for Southern California derived from waveform cross-correlation and advanced relocation techniques. Only earthquakes are included; quarry blasts and other non-tectonic events have been removed.

If you use this catalog, please cite:

Hauksson, E., Yang, W., & Shearer, P. M. (2012).Waveform Relocated Earthquake Catalog for Southern California (1981 to 2011).Bulletin of the Seismological Society of America, 102(5), 2239–2244.https://doi.org/10.1785/0120120010

The relocation methodology and catalog structure are closely related to:

Lin, G., Shearer, P. M., & Hauksson, E. (2007).Applying a three-dimensional velocity model, waveform cross correlation,and cluster analysis to locate southern California seismicity from 1981 to 2005.Journal of Geophysical Research, 112, B12309.https://doi.org/10.1029/2007JB004986

Catalog format--------------The catalog file ("California.txt") uses a fixed-width custom format with146-character lines. Each line corresponds to one earthquake event.

Example:

1981 01 01 04 13 55.710   3301565 33.25524 -115.96763   5.664  2.26  45  17   0.21   1   4   260   460      76   0.300   0.800   0.003   0.003  le ct Poly5

Variable description--------------------year                  : Event yearmonth                 : Event monthday                   : Event dayhour                  : Event hourminute                : Event minutesecond                : Event secondcuspid                : SCSN event identifierlatitude              : Latitude (degrees)longitude             : Longitude (degrees)depth                 : Depth (km)magnitude             : Preferred SCSN magnitudenpicks                : Number of P and S picks used for relocationnearest_station_km    : Distance to nearest station (km)rms                   : RMS residual of the location (s)day_night_flag        : 0 = day, 1 = nightrelocation_flag       : Relocation method identifiercluster_id            : Similar-event cluster identifiercluster_size          : Number of events in clusterndiff_times           : Number of differential times usedabs_herr_km           : Estimated absolute horizontal error (km)abs_zerr_km           : Estimated absolute depth error (km)rel_herr_km           : Relative horizontal error within cluster (km)rel_zerr_km           : Relative depth error within cluster (km)event_type            : Event type flag ("le" = local earthquake)location_type         : Relocation typepolygon               : Polygonal geographic subdivision used in catalog generation

Relocation flags----------------1 : SCSN catalog or 1D hypoinverse relocation2 : 1D SSST relocation3 : 3D velocity model relocation4 : Waveform cross-correlation relocation

Location type flags-------------------ct : Cross-correlation relocation3d : 3D relocationxx : Original SCSN location used

Notes------ Only tectonic earthquakes are included.- Quarry blasts and non-earthquake events were removed.- The catalog combines waveform cross-correlation relocations,  3D relocations, and non-relocated SCSN events.- To extract only waveform cross-correlation relocated events:

  grep " ct "

Included file-------------California.txt : Southern California relocated earthquake catalog (1981–2011)

HamiltonOH Earthquake Catalog (2015)

Description-----------This catalog contains induced seismicity associated with hydraulicfracturing operations at the Hamilton well pad in Harrison County,Ohio, USA.

The seismicity was locally recorded between August and November 2015.The catalog was enhanced using a repeating signal detection algorithmbased on waveform similarity.

The Hamilton hydraulic fracturing operations utilized a “zipper-frac”stimulation strategy, where stimulation stages alternated betweentwo horizontal well laterals.

This catalog was used in:

Xiong, Q., Brudzinski, M. R., Gossett, D., Lin, Q., & Hampton, J. C. (2023).Seismic magnitude clustering is prevalent in field and laboratory catalogs.Nature Communications, 14, 2056.https://doi.org/10.1038/s41467-023-37782-5

Original data references------------------------Skoumal, R. J., Brudzinski, M. R., & Currie, B. S. (2016).An efficient repeating signal detector to investigate earthquake swarms.Journal of Geophysical Research: Solid Earth, 121, 5880–5897.https://doi.org/10.1002/2016JB012981

Kozłowska, M. et al. (2018).Maturity of nearby faults influences seismic hazard from hydraulic fracturing.Proceedings of the National Academy of Sciences, 115, E1720–E1729.https://doi.org/10.1073/pnas.1715284115

File format-----------The catalog file ("HamiltonOH.txt") contains two columns:

1. epoch   Event origin time expressed in Unix epoch time   (seconds since 1970-01-01 UTC).

2. mag   Earthquake magnitude.

Example:

epoch          mag1438215199.97  -1.000461439729110.55  -0.8204361439729168.85  -0.731566

Notes------ The catalog contains induced seismicity related to hydraulic fracturing.- Events were recorded using a local seismic monitoring network.- The catalog includes microseismic events with negative magnitudes.- Magnitude clustering in this catalog was found to be particularly  strong compared to several other field catalogs analyzed in  Xiong et al. (2023).

Included file-------------HamiltonOH.txt : Induced seismicity catalog from the Hamiltonhydraulic fracturing site, Harrison County, Ohio, USA.

RyserOH Earthquake Catalog (2013–2014)

Description-----------This catalog contains induced seismicity associated with hydraulicfracturing operations at the Ryser well pad in Harrison County,Ohio, USA.

The seismicity was locally recorded between September 2013 andJanuary 2014. The catalog was enhanced using a repeating signaldetection algorithm based on waveform similarity.

The Ryser hydraulic fracturing operations were conducted using asequential stimulation strategy, where one horizontal well lateralwas stimulated at a time.

This catalog was used in:

Xiong, Q., Brudzinski, M. R., Gossett, D., Lin, Q., & Hampton, J. C. (2023).Seismic magnitude clustering is prevalent in field and laboratory catalogs.Nature Communications, 14, 2056.https://doi.org/10.1038/s41467-023-37782-5

Original data references------------------------Skoumal, R. J., Brudzinski, M. R., & Currie, B. S. (2016).An efficient repeating signal detector to investigate earthquake swarms.Journal of Geophysical Research: Solid Earth, 121, 5880–5897.https://doi.org/10.1002/2016JB012981

Kozłowska, M. et al. (2018).Maturity of nearby faults influences seismic hazard from hydraulic fracturing.Proceedings of the National Academy of Sciences, 115, E1720–E1729.https://doi.org/10.1073/pnas.1715284115

File format-----------The catalog file ("RyserOH.txt") contains two columns:

1. epoch   Event origin time expressed in Unix epoch time   (seconds since 1970-01-01 UTC).

2. mag   Earthquake magnitude.

Example:

epoch mag1378156909.30 -0.7263871378157696.75 -0.9096921378197482.22 -0.839106

Notes------ The catalog contains induced seismicity related to hydraulic fracturing.- Events were recorded using a local seismic monitoring network.- The catalog includes microseismic events with negative magnitudes.- The Ryser and Hamilton catalogs correspond to nearby well pads  located a few kilometers apart in Harrison County, Ohio.- In Xiong et al. (2023), the Hamilton catalog displayed a stronger  magnitude clustering signature than the Ryser catalog.

Included file-------------RyserOH.txt : Induced seismicity catalog from the Ryserhydraulic fracturing site, Harrison County, Ohio, USA.

Guthrie Earthquake Catalog (2014)

Description-----------This catalog contains induced seismicity associated with wastewaterdisposal operations near Guthrie, Oklahoma, USA.

The catalog corresponds to the Guthrie seismic cluster recorded in 2014and was constructed using a local seismic monitoring station(GS.OK029).

This catalog was used in:

Xiong, Q., Brudzinski, M. R., Gossett, D., Lin, Q., & Hampton, J. C. (2023).Seismic magnitude clustering is prevalent in field and laboratory catalogs.Nature Communications, 14, 2056.https://doi.org/10.1038/s41467-023-37782-5

Original data reference-----------------------Barbour, A. J., Norbeck, J. H., & Rubinstein, J. L. (2017).The effects of varying injection rates in Osage County, Oklahoma,on the 2016 Mw 5.8 Pawnee earthquake.Seismological Research Letters, 88(4), 1040–1053.

File format-----------The catalog file ("Guthrie.csv") is a comma-separated table containingearthquake occurrence times and magnitudes.

Columns:

1. Date   Calendar date of the earthquake event.

2. Time   Event origin time.

3. Magnitude   Earthquake magnitude.

4. Variance   Detection or waveform similarity quality metric associated with   the event identification.

Example:

Date,Time,Magnitude,Variance2/15/2014,02:41.4,0.37,0.952/15/2014,03:44.9,-0.44,0.862/15/2014,08:07.2,-0.18,0.93

Notes------ The catalog contains induced seismicity associated with fluid injection.- Events include microseismic earthquakes with negative magnitudes.- The catalog was used to investigate magnitude clustering properties  in induced seismicity sequences.- Time information is provided as calendar date and clock time rather  than Unix epoch time.

Included file-------------Guthrie.csv : Induced seismicity catalog from the Guthrie cluster,Oklahoma, USA.

West_TX Earthquake Catalog (2017–2018)

Description-----------This catalog contains induced seismicity from the Delaware Basin regionin West Texas, USA.

The seismicity was regionally recorded between March 2017 and December 2018using the TexNet seismic monitoring network and includes locally detectedmicroseismic events associated with wastewater disposal and hydrocarbonproduction activities.

This catalog was used in:

Xiong, Q., Brudzinski, M. R., Gossett, D., Lin, Q., & Hampton, J. C. (2023).Seismic magnitude clustering is prevalent in field and laboratory catalogs.Nature Communications, 14, 2056.https://doi.org/10.1038/s41467-023-37782-5

Original data reference-----------------------Savvaidis, A. et al. (2019).TexNet: A statewide seismic monitoring network in Texas.Seismological Research Letters, 90(2A), 475–487.

File format-----------The catalog file ("West_TX.txt") contains five columns:

1. epoch   Event origin time expressed in Unix epoch time   (seconds since 1970-01-01 UTC).

2. lat   Event latitude in decimal degrees.

3. lon   Event longitude in decimal degrees.

4. depth   Event depth in kilometers.

5. mag   Earthquake magnitude.

Example:

epoch           lat       lon         depth   mag1490719492.075  31.50090  -103.71070  5.80   0.551490722044.875  31.17070  -103.85320  7.50  -0.051490728328.150  31.40470  -103.48330  3.50  -0.09

Notes------ The catalog contains induced seismicity associated with  fluid injection and hydrocarbon-related activities.- Events include microseismic earthquakes with negative magnitudes.- Occurrence times are provided in Unix epoch format.- The catalog includes hypocentral information  (latitude, longitude, depth).- The Delaware Basin sequence was analyzed in Xiong et al. (2023)  to investigate seismic magnitude clustering properties.

Included file-------------West_TX.txt : Induced seismicity catalog from the Delaware Basin,West Texas, USA (March 2017 – December 2018).