Chilean Arrival Times - 1982 - mid-2020

This repository contains the arrival times produced by the Centro Sismológico Nacional (CSN, Universidad de Chile, http://www.sismologia.cl) and revised in the present study.

This archive contains 995,954 P- and 922,004 S-waves arrival-times, corresponding to 118,004 events recorded by the CSN on 271 stations between 1982 and July 2020.

Contact:

Bertrand Potin, DGF, University of Chile ([e-mail]),

Sergio Ruiz, DGF, University of Chile ([e-mail]),

Sergio Barrientos, CSN, University of Chile ([e-mail])

Arrival-times are formated by events in a text file. The corresponding station coordinates are given as a CSV archive. These arrival times correspond to the catalogue published in Potin et al. (2024) and distributed under the DOI https://doi.org/10.5281/zenodo.13146436

How to cite this material

Material doi

https://doi.org/10.5281/zenodo.13173435

Related article

Potin, B., S. Ruiz, F. Aden-Antoniow, R. Madariaga, and S. Barrientos (2024). A Revised Chilean Seismic Catalog from 1982 to Mid-2020, Seismol. Res. Lett.. https://doi.org/10.1785/0220240047

Files format

CSN_1982-2020_arrival-times.light_ins

The file correspond to a list of earthquakes, starting with a header line and followed by the corresponding arrival-times. Events are separated by an empty line.

header line:

YYMMDD hhmm sss.ss long.xxxxxx lat.xxxxxx dep.xxxx RMSxx RMSsx MAGxx # T

YYMMDD hhmm: year month day hour minute: reference time for the event (i2i2i2 i2i2).

sss.ss: seconds for the event origin, relative to reference time (f6.2). Might be negative or > 60.0

long.xxxxxx: longitude (f11.6)

lat.xxxxxx: latitude (f10.6)

dep.xxxx: depth (km) (f8.4)

RMSxx: location data ajustement (s) (f5.2)

RMSsx: normalized location data ajustement (sigma) (f5.2)

MAGxx: magnitude, either a number of the mention NOMAG (f5.2 or str)

T: magnitude type, one of:

l: local magnitude,

c: coda magnitude,

W: moment magnitude, Brune's approach,

ww: moment magnitude, W-phase approach,

xx: no magnitude.

Data line:

STAxx azi.x inc.x ph p s.ig sss.ss

STAxx: station code (s5)

azi.x: ray azimut [0.0 360.0] (f5.1)

inc.x: ray inclinaison [0 180.0] (f5.1) (0 is up)

ph: phase: "P ", "S ", "Pg", "Pn", "P1", "P2", ... (s2)

p: polarity: " ", "C", "D", "U", "+", "-"

s.ig: uncertainty (s) (f4.2)

sss.ss: arrival time, relative to reference time (s) (f6.2). Might be negative or > 60.0

Example

191103 0328 22.02 -67.289814 -24.180293 201.3188 0.36 0.76 2.80 # l
PB19 273.5 37.6 P1 0.46 59.69
PB02 331.4 51.3 P1 0.46 80.66
GO02 237.9 57.7 P1 0.46 63.85
PB09 332.1 50.4 P1 0.46 72.56
PB05 301.3 41.6 P1 0.46 71.64
PB06 309.5 42.5 P1 0.46 66.76
PB03 322.1 47.4 P1 0.46 73.51
PB19 275.8 37.6 S1 0.68 88.59
PB06 308.2 45.6 S1 0.68 101.08
PB05 294.3 57.3 S1 0.68 109.20 # <<==
PB09 327.6 50.7 S1 D 0.68 110.44

191103 0806 11.15 -72.036989 -30.727443 6.0101 0.69 1.52 5.20 # ww
CO06 75.5 118.6 S1 0.48 24.34
CO06 76.6 120.1 P1 C 0.46 19.16
CO05 46.6 129.1 P1 D 0.12 30.29
CO02 113.8 130.3 P1 C 0.46 30.32
GO04 62.7 128.8 P1 D 0.12 32.85
CO01 66.7 129.5 P1 C 0.12 43.26
...

In this example, the line marked with the sign <<== corresponds to an arrival-time measured 109.20 s after the reference time. For this earthquake, reference time is 191103 0328, which is November 3rd, 2019, at 3h28 (UTC). The arrival time is therfore 109.20 seconds after that date, at 3h29 and 49.20 seconds.

Note: the # character initiate a comment in Insight format.

CSN_1982-2020_station_list.csv

This CSV file contains the coordinates of the stations used to build the catalogue.

Format

index,station code,longitude,latitude,altitude

index: index, between 0 and 270,

station code: name of the station,

longitude: longitude in degrees,

latitude: latitude in degrees,

altitude: altitude in metres.

Example

...
59,CO02,-71.000167,-31.203500,1149
60,CO03,-70.689167,-30.839000,990
61,CO04,-70.974667,-32.043333,2401
62,CO05,-71.238333,-29.918667,101
63,CO06,-71.635000,-30.673833,240
...