Earthquake with magnitude of Md 2.1 on date 06-10-1987 and time 20:09:28 (UTC) in region 4 km NW Sellano (PG)

A magnitude Md 2.1 earthquake occured in region: 4 km NW Sellano (PG), on

  • 06-10-1987 20:09:28 (UTC)
  • 06-10-1987 21:09:28 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.91, 12.89 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
Sellano PG 4 1079 1079
Cerreto di Spoleto PG 10 1075 2154
Trevi PG 12 8469 10623
Preci PG 12 724 11347
Monte Cavallo MC 13 145 11492
Campello sul Clitunno PG 14 2442 13934
Vallo di Nera PG 16 364 14298
Visso MC 16 1107 15405
Foligno PG 16 57155 72560
Serravalle di Chienti MC 19 1070 73630
Montefalco PG 20 5679 79309
Pieve Torina MC 20 1458 80767
Sant'Anatolia di Narco PG 20 564 81331

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km E of Foligno (57155 inhabitants)
44 Km NE of Terni (111501 inhabitants)
47 Km E of Perugia (166134 inhabitants)
72 Km W of Teramo (54892 inhabitants)
75 Km NW of L'Aquila (69753 inhabitants)
85 Km NE of Viterbo (67173 inhabitants)
94 Km SW of Ancona (100861 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 2.1 1987-10-06
20:09:28
42.91 12.89 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 56579
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-10-06 20:09:28 ± 0.153
Latitude 42.91 ± 0.01
Longitude 12.89 ± 0.02
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 56579

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) 1681.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 114
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) 0.00202
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:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 56579
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:54:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1987-10-06T20:09:49.79 10.0 undecidable manual SG 3 0.0053 0.12 0.5
--.ALP.Z. 1987-10-06T20:09:47.60 10.0 undecidable manual SG 104 0.0045 0.45 0.3
--.MNS.Z. 1987-10-06T20:09:47.36 10.0 undecidable manual SG 196 0.0049 -0.96 0
--.ARV.Z. 1987-10-06T20:09:40.58 10.0 positive manual PG 3 0.0053 -0.28 1.9
--.MNS.Z. 1987-10-06T20:09:40.28 10.0 positive manual PG 196 0.0049 0.2 2.4
--.ALP.Z. 1987-10-06T20:09:39.25 10.0 undecidable manual PG 104 0.0045 -0.16 1.3
--.ASS.Z. 1987-10-06T20:09:38.54 10.0 undecidable manual SG 310 0.002 0.33 0.4
--.ASS.Z. 1987-10-06T20:09:34.49 10.0 undecidable manual PG 310 0.002 0.25 1.2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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