Earthquake with magnitude of Md 3.1 on date 31-03-1991 and time 05:29:09 (Italy) in region 2 km W Monteleone di Spoleto (PG)

A magnitude Md 3.1 earthquake occured in region: 2 km W Monteleone di Spoleto (PG), on

  • 31-03-1991 03:29:09 (UTC)
  • 31-03-1991 05:29:09 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.65, 12.93 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
Monteleone di Spoleto PG 2 599 599
Poggiodomo PG 7 117 716
Polino TR 10 233 949
Leonessa RI 10 2435 3384
Cascia PG 11 3217 6601
Scheggino PG 11 461 7062
Ferentillo TR 12 1913 8975
Sant'Anatolia di Narco PG 12 564 9539
Montefranco TR 14 1276 10815
Vallo di Nera PG 15 364 11179
Arrone TR 15 2763 13942
Morro Reatino RI 16 373 14315
Rivodutri RI 16 1253 15568
Poggio Bustone RI 17 2055 17623
Labro RI 17 374 17997
Spoleto PG 18 38218 56215
Cerreto di Spoleto PG 19 1075 57290
Cittareale RI 19 482 57772
Posta RI 20 694 58466
Cantalice RI 20 2755 61221

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km E of Terni (111501 inhabitants)
39 Km SE of Foligno (57155 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
64 Km W of Teramo (54892 inhabitants)
67 Km SE of Perugia (166134 inhabitants)
72 Km E of Viterbo (67173 inhabitants)
74 Km N of Guidonia Montecelio (88673 inhabitants)
77 Km N of Tivoli (56533 inhabitants)
92 Km NE of Roma (2864731 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 3.1
ML-VAX 2.3
1991-03-31
03:29:09
42.65 12.93 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 138469
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-03-31 03:29:09 ± 0.185
Latitude 42.65 ± 0.01
Longitude 12.93 ± 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 138469

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) 2288
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 129
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.8
Epicentral distance of station closest to the epicenter (degree) 0.00283
Epicentral distance of station farthest from the epicenter (degree) 0.03545
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitudes information

Md:3.1

Field Value
Value 3.1
Uncertainty
Num. used stations 6
Type of magnitude Md
Reference to an origin 138469
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:09:12

ML:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 7
Type of magnitude ML
Reference to an origin 138469
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
--.BDI.Z. 1991-03-31T03:30:14.50 10.0 undecidable manual SN 310 0.0198 0.89 0.4
--.FVI.Z. 1991-03-31T03:30:10.89 10.0 undecidable manual PN 358 0.0355 0.59 0.8
--.CTI.Z. 1991-03-31T03:30:04.61 10.0 undecidable manual PN 345 0.0317 0.17 1.1
--.SFI.Z. 1991-03-31T03:29:57.83 10.0 undecidable manual SN 328 0.0133 1.46 0.3
--.CRE.Z. 1991-03-31T03:29:49.81 10.0 undecidable manual SN 323 0.0108 0.01 0.9
--.SDI.Z. 1991-03-31T03:29:48.87 10.0 undecidable manual SN 144 0.0103 0.54 0.7
--.BDI.Z. 1991-03-31T03:29:46.66 10.0 undecidable manual PN 310 0.0198 0.23 1.5
--.RMP.Z. 1991-03-31T03:29:39.00 10.0 undecidable manual SG 191 0.0076 -0.55 0.7
--.RFI.Z. 1991-03-31T03:29:39.00 10.0 undecidable manual PN 149 0.014 1.46 0.6
--.CP9.Z. 1991-03-31T03:29:38.00 10.0 undecidable manual SG 178 0.007 0.59 0.7
--.DUI.Z. 1991-03-31T03:29:38.20 10.0 undecidable manual PN 130 0.0135 1.41 0.7
--.ARV.Z. 1991-03-31T03:29:38.68 10.0 undecidable manual SG 0 0.0076 -0.8 0.6
--.RSM.Z. 1991-03-31T03:29:35.77 10.0 undecidable manual PN 344 0.0119 1.42 0.7
--.MAO.Z. 1991-03-31T03:29:35.50 10.0 undecidable manual PN 260 0.0119 1.13 1.1
--.AZI.Z. 1991-03-31T03:29:35.98 10.0 undecidable manual SG 150 0.0068 -0.59 0.7
--.SFI.Z. 1991-03-31T03:29:35.85 10.0 undecidable manual PN 328 0.0133 -0.63 1.6
--.SDI.Z. 1991-03-31T03:29:32.19 10.0 undecidable manual PN 144 0.0103 0.35 2
--.CRE.Z. 1991-03-31T03:29:32.64 10.0 undecidable manual PN 323 0.0108 -0.04 2.1
--.RDP.Z. 1991-03-31T03:29:26.00 10.0 undecidable manual PG 189 0.0081 -1.7 0.5
--.ASS.Z. 1991-03-31T03:29:26.37 10.0 undecidable manual SG 333 0.0041 -0.6 0.7
--.AQU.Z. 1991-03-31T03:29:26.96 10.0 undecidable manual SG 129 0.004 0.13 0.8
--.RMP.Z. 1991-03-31T03:29:25.50 10.0 undecidable manual PG 191 0.0076 -1.27 1
--.AZI.Z. 1991-03-31T03:29:25.65 10.0 undecidable manual PG 150 0.0068 0.6 1.8
--.CP9.Z. 1991-03-31T03:29:24.48 10.0 undecidable manual PG 178 0.007 -1.05 1.2
--.ARV.Z. 1991-03-31T03:29:24.81 10.0 undecidable manual PG 0 0.0076 -1.92 0.3
--.MNS.Z. 1991-03-31T03:29:21.71 10.0 undecidable manual SG 214 0.0028 -0.04 0.9
--.ASS.Z. 1991-03-31T03:29:18.32 10.0 undecidable manual PG 333 0.0041 -1.19 1.1
--.AQU.Z. 1991-03-31T03:29:18.46 10.0 undecidable manual PG 129 0.004 -0.96 1.3
--.MNS.Z. 1991-03-31T03:29:16.72 10.0 undecidable manual PG 214 0.0028 0.23 2.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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