Earthquake with magnitude of Md 2.3 on date 18-02-1987 and time 22:22:36 (Italy) in region 10 km E Foligno (PG)

A magnitude Md 2.3 earthquake occured in region: 10 km E Foligno (PG), on

  • 18-02-1987 21:22:36 (UTC)
  • 18-02-1987 22:22:36 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.96, 12.83 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
Foligno PG 10 57155 57155
Sellano PG 11 1079 58234
Trevi PG 12 8469 66703
Valtopina PG 13 1398 68101
Spello PG 14 8645 76746
Monte Cavallo MC 14 145 76891
Serravalle di Chienti MC 16 1070 77961
Campello sul Clitunno PG 16 2442 80403
Montefalco PG 16 5679 86082
Nocera Umbra PG 17 5839 91921
Cerreto di Spoleto PG 17 1075 92996
Bevagna PG 18 5081 98077
Preci PG 19 724 98801

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km E of Foligno (57155 inhabitants)
40 Km E of Perugia (166134 inhabitants)
47 Km NE of Terni (111501 inhabitants)
79 Km W of Teramo (54892 inhabitants)
82 Km NW of L'Aquila (69753 inhabitants)
85 Km NE of Viterbo (67173 inhabitants)
92 Km SW of Ancona (100861 inhabitants)
95 Km SE of Arezzo (99543 inhabitants)
99 Km S of Fano (60888 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
Bulletin
Rev1000
Md 2.3 1987-02-18
21:22:36
42.96 12.83 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 41679
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-02-18 21:22:36 ± 0.242
Latitude 42.96 ± 0.01
Longitude 12.83 ± 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 41679

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) 2142.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 198
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) 0.00146
Epicentral distance of station farthest from the epicenter (degree) 0.0051
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:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 41679
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:41:27
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1987-02-18T21:22:56.00 10.0 undecidable manual SG 8 0.0049 0.21 0.6
--.ALP.Z. 1987-02-18T21:22:56.64 10.0 undecidable manual SG 108 0.0051 0.01 1.1
--.ALP.Z. 1987-02-18T21:22:48.30 10.0 undecidable manual PG 108 0.0051 -0.08 1.7
--.ARV.Z. 1987-02-18T21:22:47.50 10.0 undecidable manual PG 8 0.0049 -0.12 1.7
--.ASS.Z. 1987-02-18T21:22:43.00 10.0 undecidable manual SG 307 0.0015 -0.66 0.1
--.ASS.Z. 1987-02-18T21:22:41.00 10.0 undecidable manual PG 307 0.0015 0.38 0.9
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
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