Earthquake with magnitude of Md 2.0 on date 28-10-1987 and time 01:32:06 (UTC) in region 6 km NW Preci (PG)

A magnitude Md 2.0 earthquake occured in region: 6 km NW Preci (PG), on

  • 28-10-1987 01:32:06 (UTC)
  • 28-10-1987 02:32:06 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.92, 13 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Preci PG 6 724 724
Sellano PG 7 1079 1803
Visso MC 8 1107 2910
Monte Cavallo MC 8 145 3055
Ussita MC 12 444 3499
Castelsantangelo sul Nera MC 13 281 3780
Cerreto di Spoleto PG 13 1075 4855
Pieve Torina MC 15 1458 6313
Fiordimonte MC 15 202 6515
Norcia PG 16 4957 11472
Pievebovigliana MC 17 866 12338
Serravalle di Chienti MC 17 1070 13408
Fiastra MC 18 559 13967
Muccia MC 18 915 14882
Acquacanina MC 19 121 15003

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km E of Foligno (57155 inhabitants)
49 Km NE of Terni (111501 inhabitants)
54 Km E of Perugia (166134 inhabitants)
65 Km W of Teramo (54892 inhabitants)
71 Km NW of L'Aquila (69753 inhabitants)
88 Km SW of Ancona (100861 inhabitants)
92 Km NE of Viterbo (67173 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 1000 Md 2.0 1987-10-28
01:32:06
42.92 13 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 57779
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-10-28 01:32:06 ± 0.106
Latitude 42.92 ± 0.01
Longitude 13.00 ± 0.01
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 57779

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 1244.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 182
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00259
Epicentral distance of station farthest from the epicenter (degree) 0.00526
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:2

Field Value
Value 2
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 57779
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:55:22
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1987-10-28T01:32:27.50 10.0 undecidable manual SG 203 0.0053 -0.01 0.7
--.ARV.Z. 1987-10-28T01:32:26.84 10.0 undecidable manual SG 356 0.0052 -0.46 0.1
--.MNS.Z. 1987-10-28T01:32:18.60 10.0 undecidable manual PG 203 0.0053 -0.16 1.4
--.CM8.Z. 1987-10-28T01:32:18.12 10.0 undecidable manual SG 21 0.0026 -0.02 1.3
--.ARV.Z. 1987-10-28T01:32:18.60 10.0 undecidable manual PG 356 0.0052 -0.04 1.8
--.ASS.Z. 1987-10-28T01:32:17.76 10.0 undecidable manual SG 299 0.0026 -0.27 0.4
--.ASS.Z. 1987-10-28T01:32:13.64 10.0 undecidable manual PG 299 0.0026 0.35 0.6
--.CM8.Z. 1987-10-28T01:32:13.52 10.0 undecidable manual PG 21 0.0026 0.17 1.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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