Earthquake with magnitude of Md 2.3 on date 23-10-1987 and time 04:45:24 (UTC) in region 3 km E Monte Cavallo (MC)

A magnitude Md 2.3 earthquake occured in region: 3 km E Monte Cavallo (MC), on

  • 23-10-1987 04:45:24 (UTC)
  • 23-10-1987 05:45:24 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43, 13.04 at 5 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
Monte Cavallo MC 3 145 145
Pieve Torina MC 6 1458 1603
Fiordimonte MC 6 202 1805
Visso MC 8 1107 2912
Pievebovigliana MC 8 866 3778
Muccia MC 10 915 4693
Ussita MC 10 444 5137
Fiastra MC 11 559 5696
Serravalle di Chienti MC 11 1070 6766
Acquacanina MC 12 121 6887
Preci PG 13 724 7611
Castelsantangelo sul Nera MC 15 281 7892
Sellano PG 15 1079 8971
Bolognola MC 15 142 9113
Camerino MC 16 6974 16087
Sefro MC 18 422 16509

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km E of Foligno (57155 inhabitants)
54 Km E of Perugia (166134 inhabitants)
58 Km NE of Terni (111501 inhabitants)
66 Km NW of Teramo (54892 inhabitants)
77 Km NW of L'Aquila (69753 inhabitants)
79 Km SW of Ancona (100861 inhabitants)
94 Km S of Fano (60888 inhabitants)
100 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 2.3 1987-10-23
04:45:24
43 13.04 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 57509
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-10-23 04:45:24 ± 0.188
Latitude 43.00 ± 0.01
Longitude 13.04 ± 0.02
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 57509

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) 1754.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 82
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00186
Epicentral distance of station farthest from the epicenter (degree) 0.01263
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 57509
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:55:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SDI.Z. 1987-10-23T04:46:11.49 10.0 undecidable manual SN 155 0.0126 1.26 0.1
--.CRE.Z. 1987-10-23T04:46:01.00 10.0 undecidable manual SG 308 0.0091 0.82 0.3
--.SDI.Z. 1987-10-23T04:45:52.49 10.0 undecidable manual PN 155 0.0126 1.4 0.2
--.AQU.Z. 1987-10-23T04:45:50.50 10.0 undecidable manual SG 157 0.0062 0.38 0.5
--.AM8.Z. 1987-10-23T04:45:50.53 10.0 undecidable manual SG 36 0.0062 0.67 0.6
--.MNS.Z. 1987-10-23T04:45:49.11 10.0 undecidable manual SG 203 0.006 -0.08 0.6
--.CRE.Z. 1987-10-23T04:45:46.70 10.0 undecidable manual PG 308 0.0091 1.41 0.2
--.ARV.Z. 1987-10-23T04:45:42.86 10.0 undecidable manual SG 352 0.0045 -1.24 0.2
--.ALP.Z. 1987-10-23T04:45:41.73 10.0 undecidable manual SG 119 0.004 -0.27 0.9
--.AQU.Z. 1987-10-23T04:45:39.00 10.0 undecidable manual PG 157 0.0062 -0.48 1.2
--.AM8.Z. 1987-10-23T04:45:39.30 10.0 undecidable manual PG 36 0.0062 -0.3 1.4
--.MNS.Z. 1987-10-23T04:45:38.18 10.0 positive manual PG 203 0.006 -0.77 1.8
--.ARV.Z. 1987-10-23T04:45:35.14 10.0 positive manual PG 352 0.0045 -0.87 1.6
--.ASS.Z. 1987-10-23T04:45:35.52 10.0 undecidable manual SG 283 0.0026 -0.79 0.4
--.ALP.Z. 1987-10-23T04:45:34.54 10.0 undecidable manual PG 119 0.004 -0.25 1.5
--.CM8.Z. 1987-10-23T04:45:33.50 10.0 undecidable manual SG 20 0.0019 0.2 0.9
--.ASS.Z. 1987-10-23T04:45:31.80 10.0 positive manual PG 283 0.0026 0.3 2.9
--.CM8.Z. 1987-10-23T04:45:29.95 10.0 positive manual PG 20 0.0019 0.18 3
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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