Earthquake with magnitude of Md 2.4 on date 18-10-1991 and time 04:45:03 (UTC) in region 4 km SE Monte Cavallo (MC)

A magnitude Md 2.4 earthquake occured in region: 4 km SE Monte Cavallo (MC), on

  • 18-10-1991 04:45:03 (UTC)
  • 18-10-1991 05:45:03 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.97, 13.03 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
Monte Cavallo MC 4 145 145
Visso MC 7 1107 1252
Pieve Torina MC 9 1458 2710
Fiordimonte MC 9 202 2912
Ussita MC 9 444 3356
Preci PG 10 724 4080
Pievebovigliana MC 12 866 4946
Sellano PG 12 1079 6025
Muccia MC 13 915 6940
Fiastra MC 13 559 7499
Serravalle di Chienti MC 13 1070 8569
Castelsantangelo sul Nera MC 13 281 8850
Acquacanina MC 14 121 8971
Bolognola MC 17 142 9113
Cerreto di Spoleto PG 19 1075 10188
Camerino MC 19 6974 17162

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km E of Foligno (57155 inhabitants)
54 Km E of Perugia (166134 inhabitants)
55 Km NE of Terni (111501 inhabitants)
65 Km NW of Teramo (54892 inhabitants)
75 Km NW of L'Aquila (69753 inhabitants)
82 Km SW of Ancona (100861 inhabitants)
97 Km NE of Viterbo (67173 inhabitants)
97 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 2.4
ML-VAX 2.0
1991-10-18
04:45:03
42.97 13.03 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 151149
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-10-18 04:45:03 ± 0.187
Latitude 42.97 ± 0.01
Longitude 13.03 ± 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 151149

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) 1583.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 210
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00259
Epicentral distance of station farthest from the epicenter (degree) 0.00915
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitudes information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 151149
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:21:04

ML:2

Field Value
Value 2
Uncertainty
Num. used stations 1
Type of magnitude ML
Reference to an origin 151149
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.MNS.Z. 1991-10-18T04:45:25.66 10.0 undecidable manual SG 203 0.0057 0.24 0.4
--.CRE.Z. 1991-10-18T04:45:23.00 10.0 undecidable manual PG 309 0.0091 -0.04 1.3
--.ARV.Z. 1991-10-18T04:45:22.69 10.0 undecidable manual SG 353 0.0048 0.59 0
--.MNS.Z. 1991-10-18T04:45:15.97 10.0 undecidable manual PG 203 0.0057 0 1.8
--.ASS.Z. 1991-10-18T04:45:14.36 10.0 undecidable manual SG 288 0.0026 0.08 0.7
--.ARV.Z. 1991-10-18T04:45:13.84 10.0 undecidable manual PG 353 0.0048 -0.21 1.1
--.ASS.Z. 1991-10-18T04:45:09.42 10.0 undecidable manual PG 288 0.0026 -0.12 1.6
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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