Earthquake with magnitude of Md 2.4 on date 17-12-1987 and time 18:28:35 (UTC) in region 1 km NE Visso (MC)

A magnitude Md 2.4 earthquake occured in region: 1 km NE Visso (MC), on

  • 17-12-1987 18:28:35 (UTC)
  • 17-12-1987 19:28:35 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.94, 13.1 at 0 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
Visso MC 2 1107 1107
Ussita MC 3 444 1551
Castelsantangelo sul Nera MC 7 281 1832
Preci PG 9 724 2556
Monte Cavallo MC 10 145 2701
Fiordimonte MC 11 202 2903
Fiastra MC 12 559 3462
Acquacanina MC 12 121 3583
Bolognola MC 12 142 3725
Pieve Torina MC 12 1458 5183
Pievebovigliana MC 14 866 6049
Sellano PG 15 1079 7128
Norcia PG 16 4957 12085
Muccia MC 17 915 13000
Montemonaco AP 19 604 13604
Serravalle di Chienti MC 19 1070 14674
Sarnano MC 19 3264 17938
Montefortino FM 20 1178 19116

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km E of Foligno (57155 inhabitants)
56 Km NE of Terni (111501 inhabitants)
58 Km NW of Teramo (54892 inhabitants)
61 Km E of Perugia (166134 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
83 Km SW of Ancona (100861 inhabitants)
98 Km W of Montesilvano (53738 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 2.4 1987-12-17
18:28:35
42.94 13.1 0 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 59679
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-12-17 18:28:35 ± 0.323
Latitude 42.94 ± 0.02
Longitude 13.10 ± 0.02
Depth (km) 0 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 59679

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) 2411
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
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) 0.00227
Epicentral distance of station farthest from the epicenter (degree) 0.01198
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 59679
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:57:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SDI.Z. 1987-12-17T18:29:03.50 10.0 undecidable manual PN 156 0.012 1.65 0.1
--.AM8.Z. 1987-12-17T18:29:03.30 10.0 undecidable manual SG 30 0.0063 0.58 0.4
--.ARV.Z. 1987-12-17T18:28:56.72 10.0 undecidable manual SG 348 0.0051 -1.2 0.2
--.AQU.Z. 1987-12-17T18:28:50.00 10.0 undecidable manual PG 159 0.0056 0.3 1.5
--.AM8.Z. 1987-12-17T18:28:50.75 10.0 undecidable manual PG 30 0.0063 -0.5 1.2
--.ALP.Z. 1987-12-17T18:28:49.57 10.0 undecidable manual SG 114 0.0033 -0.84 0.3
--.ASS.Z. 1987-12-17T18:28:49.47 10.0 undecidable manual SG 290 0.0032 0 0.7
--.ARV.Z. 1987-12-17T18:28:48.20 10.0 undecidable manual PG 348 0.0051 -0.43 1.4
--.CM8.Z. 1987-12-17T18:28:46.90 10.0 undecidable manual SG 6 0.0023 1.07 0.2
--.MC8.Z. 1987-12-17T18:28:45.70 10.0 undecidable manual PG 33 0.0037 0.37 1.6
--.ASS.Z. 1987-12-17T18:28:43.58 10.0 positive manual PG 290 0.0032 -0.17 3.3
--.ALP.Z. 1987-12-17T18:28:43.32 10.0 undecidable manual PG 114 0.0033 -0.97 0.7
--.CM8.Z. 1987-12-17T18:28:42.27 10.0 undecidable manual PG 6 0.0023 0.63 1.3
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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