Earthquake with magnitude of Md 2.7 on date 03-08-1991 and time 19:38:00 (UTC) in region 2 km NW Vallo di Nera (PG)

A magnitude Md 2.7 earthquake occured in region: 2 km NW Vallo di Nera (PG), on

  • 03-08-1991 19:38:00 (UTC)
  • 03-08-1991 21:38:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.79, 12.85 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
Vallo di Nera PG 2 364 364
Sant'Anatolia di Narco PG 6 564 928
Cerreto di Spoleto PG 6 1075 2003
Campello sul Clitunno PG 7 2442 4445
Scheggino PG 9 461 4906
Poggiodomo PG 11 117 5023
Spoleto PG 11 38218 43241
Sellano PG 13 1079 44320
Trevi PG 13 8469 52789
Castel Ritaldi PG 15 3278 56067
Cascia PG 15 3217 59284
Monteleone di Spoleto PG 17 599 59883
Preci PG 18 724 60607
Ferentillo TR 19 1913 62520
Norcia PG 20 4957 67477

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km SE of Foligno (57155 inhabitants)
30 Km NE of Terni (111501 inhabitants)
52 Km SE of Perugia (166134 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
71 Km W of Teramo (54892 inhabitants)
74 Km NE of Viterbo (67173 inhabitants)
88 Km N of Guidonia Montecelio (88673 inhabitants)
92 Km N of Tivoli (56533 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 2.7
ML-VAX 1.9
1991-08-03
19:38:00
42.79 12.85 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 146769
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-08-03 19:38:00 ± 0.225
Latitude 42.79 ± 0.01
Longitude 12.85 ± 0.03
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 146769

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) 2941.5
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 16
Number of defining phases 16
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) 0.00275
Epicentral distance of station farthest from the epicenter (degree) 0.01222
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

Md:2.7

Field Value
Value 2.7
Uncertainty
Num. used stations 7
Type of magnitude Md
Reference to an origin 146769
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:16:58

ML:1.9

Field Value
Value 1.9
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 146769
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
--.SDI.Z. 1991-08-03T19:38:44.50 10.0 undecidable manual SN 146 0.0116 1.48 0.1
--.CRE.Z. 1991-08-03T19:38:36.61 10.0 undecidable manual SG 321 0.0095 -0.73 0.5
--.CP9.Z. 1991-08-03T19:38:33.65 10.0 undecidable manual SG 175 0.0083 0.47 0.6
--.PGD.Z. 1991-08-03T19:38:27.00 10.0 undecidable manual PN 323 0.0122 0.98 0.7
--.SFI.Z. 1991-08-03T19:38:26.46 10.0 undecidable manual PN 326 0.012 0.85 0.9
--.ARV.Z. 1991-08-03T19:38:25.50 10.0 undecidable manual SG 5 0.0064 -0.73 0.8
--.SDI.Z. 1991-08-03T19:38:25.65 10.0 undecidable manual PN 146 0.0116 0.61 1.2
--.AQU.Z. 1991-08-03T19:38:23.00 10.0 undecidable manual SG 136 0.0053 0.59 0.6
--.CRE.Z. 1991-08-03T19:38:21.84 10.0 undecidable manual PG 321 0.0095 0.09 1.8
--.CP9.Z. 1991-08-03T19:38:20.20 10.0 undecidable manual PG 175 0.0083 0.84 1.1
--.MNS.Z. 1991-08-03T19:38:16.40 10.0 undecidable manual SG 197 0.0038 -0.82 0.5
--.ARV.Z. 1991-08-03T19:38:14.18 10.0 undecidable manual PG 5 0.0064 -1.16 0.7
--.ASS.Z. 1991-08-03T19:38:13.00 10.0 undecidable manual SG 331 0.0028 0.45 1
--.AQU.Z. 1991-08-03T19:38:12.00 10.0 undecidable manual PG 136 0.0053 -1.14 0.7
--.MNS.Z. 1991-08-03T19:38:09.24 10.0 negative manual PG 197 0.0038 -0.7 2.8
--.ASS.Z. 1991-08-03T19:38:07.50 10.0 undecidable manual PG 331 0.0028 0.05 2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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