Earthquake with magnitude of Md 2.7 on date 10-04-1991 and time 11:45:05 (Italy) in region 4 km W Preci (PG)

A magnitude Md 2.7 earthquake occured in region: 4 km W Preci (PG), on

  • 10-04-1991 09:45:05 (UTC)
  • 10-04-1991 11:45:05 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.88, 13 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
Preci PG 4 724 724
Sellano PG 6 1079 1803
Cerreto di Spoleto PG 9 1075 2878
Visso MC 10 1107 3985
Monte Cavallo MC 13 145 4130
Norcia PG 13 4957 9087
Castelsantangelo sul Nera MC 13 281 9368
Ussita MC 14 444 9812
Vallo di Nera PG 16 364 10176
Cascia PG 18 3217 13393
Pieve Torina MC 19 1458 14851
Campello sul Clitunno PG 19 2442 17293
Fiordimonte MC 19 202 17495
Poggiodomo PG 19 117 17612

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km E of Foligno (57155 inhabitants)
46 Km NE of Terni (111501 inhabitants)
55 Km E of Perugia (166134 inhabitants)
63 Km W of Teramo (54892 inhabitants)
67 Km NW of L'Aquila (69753 inhabitants)
89 Km NE of Viterbo (67173 inhabitants)
92 Km SW of Ancona (100861 inhabitants)
100 Km N of Guidonia Montecelio (88673 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 2.7
ML-VAX 2.0
1991-04-10
09:45:05
42.88 13 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 138919
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-04-10 09:45:05 ± 0.333
Latitude 42.88 ± 0.02
Longitude 13.00 ± 0.04
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 138919

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) 3647.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 109
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.7
Epicentral distance of station closest to the epicenter (degree) 0.00154
Epicentral distance of station farthest from the epicenter (degree) 0.01222
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

Md:2.7

Field Value
Value 2.7
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 138919
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:09:38

ML:2

Field Value
Value 2
Uncertainty
Num. used stations 1
Type of magnitude ML
Reference to an origin 138919
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
--.SFI.Z. 1991-04-10T09:45:31.60 10.0 undecidable manual PN 321 0.0118 1.11 0.7
--.PGD.Z. 1991-04-10T09:45:30.73 10.0 undecidable manual PN 317 0.0122 -0.29 1.3
--.ARV.Z. 1991-04-10T09:45:28.34 10.0 undecidable manual SG 356 0.0055 0.08 0.8
--.CRE.Z. 1991-04-10T09:45:27.23 10.0 undecidable manual PG 314 0.0095 0.39 1.5
--.MNS.Z. 1991-04-10T09:45:25.18 10.0 undecidable manual SG 205 0.0049 -0.81 0.5
--.AQU.Z. 1991-04-10T09:45:20.00 10.0 undecidable manual PG 150 0.0054 1.59 0.4
--.ARV.Z. 1991-04-10T09:45:18.14 10.0 undecidable manual PG 356 0.0055 -0.52 1.6
--.MNS.Z. 1991-04-10T09:45:16.28 10.0 undecidable manual PG 205 0.0049 -1.06 0.9
--.RMF.Z. 1991-04-10T09:45:08.70 10.0 undecidable manual PG 64 0.0015 -0.79 1.3
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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