Earthquake with magnitude of Md 2.2 on date 31-12-1987 and time 17:46:44 (UTC) in region 9 km NW Sellano (PG)

A magnitude Md 2.2 earthquake occured in region: 9 km NW Sellano (PG), on

  • 31-12-1987 17:46:44 (UTC)
  • 31-12-1987 18:46:44 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.96, 12.88 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 9 1079 1079
Monte Cavallo MC 10 145 1224
Serravalle di Chienti MC 14 1070 2294
Trevi PG 14 8469 10763
Foligno PG 15 57155 67918
Valtopina PG 15 1398 69316
Preci PG 16 724 70040
Cerreto di Spoleto PG 16 1075 71115
Pieve Torina MC 17 1458 72573
Visso MC 17 1107 73680
Spello PG 18 8645 82325
Campello sul Clitunno PG 18 2442 84767
Nocera Umbra PG 18 5839 90606
Fiordimonte MC 19 202 90808
Muccia MC 19 915 91723
Pievebovigliana MC 20 866 92589

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km E of Foligno (57155 inhabitants)
44 Km E of Perugia (166134 inhabitants)
48 Km NE of Terni (111501 inhabitants)
75 Km W of Teramo (54892 inhabitants)
80 Km NW of L'Aquila (69753 inhabitants)
88 Km NE of Viterbo (67173 inhabitants)
89 Km SW of Ancona (100861 inhabitants)
99 Km S of Fano (60888 inhabitants)
99 Km SE of Arezzo (99543 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 2.2 1987-12-31
17:46:44
42.96 12.89 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 60229
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-12-31 17:46:44 ± 0.341
Latitude 42.96 ± 0.02
Longitude 12.89 ± 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 60229

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) 2529.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 261
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
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) 0.00178
Epicentral distance of station farthest from the epicenter (degree) 0.00478
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 60229
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:57:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1987-12-31T17:47:04.00 10.0 undecidable manual SG 4 0.0048 0.17 0.5
--.ARV.Z. 1987-12-31T17:46:56.00 10.0 undecidable manual PG 4 0.0048 0.3 0.8
--.CM8.Z. 1987-12-31T17:46:55.63 10.0 undecidable manual SG 38 0.0027 -0.53 0.1
--.ASS.Z. 1987-12-31T17:46:52.55 10.0 undecidable manual SG 300 0.0018 -0.33 0.3
--.CM8.Z. 1987-12-31T17:46:51.26 10.0 undecidable manual PG 38 0.0027 -0.01 2.1
--.ASS.Z. 1987-12-31T17:46:49.37 10.0 undecidable manual PG 300 0.0018 -0.01 2.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
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