OR/18/015 Appendix 1 - Key to catalogue encoding

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Galloway, D D. 2018. Bulletin of British Earthquakes 2017. British Geological Survey. (OR/18/015).
YearMoDy Year, month and day of event.
HrMn Secs Time of occurrence of event in hours, mins and secs, (UTC).
Lat Latitude of the event, positive latitude indicates North.
Lon Longitude of the event, positive longitude indicates East.
kmE UK National Grid Reference in kilometres east of grid origin.
kmN UK National Grid Reference in kilometres north of grid origin.
Dep Depth of the hypocentre in kilometres.
Mag Richter local magnitude of the event.
Locality A geographical indication of the epicentral area, usually the nearest town followed by the region. A key to the abbreviations used in the locality column are given below.
Int Maximum EMS intensity. 2, 3, 4, 5 etc. describes the maximum EMS intensity produced by the event.
Comments Additional comments about the event e.g.: C/F, see below under comments abbreviations.

The following abbreviations are extracted from the output of the location program HYPOCENTER (Leinart and Havskov, 1995[1])
No Total number of P and S readings used in the event location.
Gap Largest azimuthal separation in degrees between stations.
RMS Root Mean Square of the travel time residuals in seconds.
ERH Standard error of the epicentre in kilometres. When this column is blank, the error is large and indeterminate.
ERZ Standard error of the focal depth in kilometres. When this column is blank, the error is large and indeterminate.

Locality and Comments abbreviations
Sonic Sonic event
Worcs Worcestershire
Oxon Oxfordshire
D & G Dumfries & Galloway
Carmarths Carmarthenshire
Glos Gloucestershire
Lincs Lincolnshire
Salop Shropshire
E Dunbarton East Dunbartonshire
and felt elsewhere


  1. Lienert, B R E, and Havskov, J. 1995. A computer program for locating earthquakes both locally and globally, Seis. Res. Lett., 66, 26–36.