Earthquake with magnitude of Md 3.0 on date 04-07-1991 and time 00:36:21 (Italy) in region 6 km SE Valtopina (PG)

A magnitude Md 3.0 earthquake occured in region: 6 km SE Valtopina (PG), on

  • 03-07-1991 22:36:21 (UTC)
  • 04-07-1991 00:36:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.02, 12.81 at 4 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
Valtopina PG 6 1398 1398
Foligno PG 11 57155 58553
Nocera Umbra PG 11 5839 64392
Spello PG 11 8645 73037
Serravalle di Chienti MC 14 1070 74107
Trevi PG 16 8469 82576
Monte Cavallo MC 16 145 82721
Assisi PG 17 28299 111020
Sellano PG 17 1079 112099
Cannara PG 18 4305 116404
Bevagna PG 18 5081 121485
Montefalco PG 18 5679 127164
Sefro MC 19 422 127586

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km NE of Foligno (57155 inhabitants)
35 Km E of Perugia (166134 inhabitants)
52 Km N of Terni (111501 inhabitants)
83 Km W of Teramo (54892 inhabitants)
88 Km NE of Viterbo (67173 inhabitants)
88 Km NW of L'Aquila (69753 inhabitants)
88 Km SW of Ancona (100861 inhabitants)
90 Km SE of Arezzo (99543 inhabitants)
94 Km S of Fano (60888 inhabitants)
100 Km S of Pesaro (94582 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 3.0
ML-VAX 2.5
1991-07-03
22:36:21
43.02 12.81 4 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 144559
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-07-03 22:36:21 ± 0.158
Latitude 43.02 ± 0.01
Longitude 12.81 ± 0.01
Depth (km) 4 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 144559

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) 1298.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 103
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.00105
Epicentral distance of station farthest from the epicenter (degree) 0.01352
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

Md:3

Field Value
Value 3
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 144559
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:14:59

ML:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 2
Type of magnitude ML
Reference to an origin 144559
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
--.PGD.Z. 1991-07-03T22:37:00.78 10.0 undecidable manual SN 317 0.0104 -0.21 0.5
--.RSM.Z. 1991-07-03T22:36:54.59 10.0 undecidable manual SG 344 0.0085 -0.09 0.6
--.CRE.Z. 1991-07-03T22:36:52.20 10.0 undecidable manual SG 314 0.0078 0.13 0.6
--.AQU.Z. 1991-07-03T22:36:50.91 10.0 undecidable manual SG 146 0.0071 1.15 0.1
--.AOI.Z. 1991-07-03T22:36:50.21 10.0 undecidable manual SG 47 0.007 0.7 0.3
--.SDI.Z. 1991-07-03T22:36:50.00 10.0 undecidable manual PN 149 0.0135 1.16 0.1
--.MNS.Z. 1991-07-03T22:36:44.15 10.0 undecidable manual SG 188 0.0057 -0.61 0.4
--.PGD.Z. 1991-07-03T22:36:44.68 10.0 undecidable manual PN 317 0.0104 0.47 0.9
--.SFI.Z. 1991-07-03T22:36:43.76 10.0 undecidable manual PN 322 0.0101 0.06 1.3
--.ALP.Z. 1991-07-03T22:36:43.64 10.0 undecidable manual SG 112 0.0054 -0.06 0.7
--.RSM.Z. 1991-07-03T22:36:41.14 10.0 undecidable manual PG 344 0.0085 0.57 0.8
--.SSO.Z. 1991-07-03T22:36:41.90 10.0 undecidable manual SG 57 0.0047 0.73 0.3
--.ARV.Z. 1991-07-03T22:36:39.39 10.0 undecidable manual SG 11 0.0044 -0.7 0.3
--.CRE.Z. 1991-07-03T22:36:38.64 10.0 undecidable manual PG 314 0.0078 -0.42 1.1
--.AOI.Z. 1991-07-03T22:36:37.41 10.0 undecidable manual PG 47 0.007 -0.17 1.6
--.AQU.Z. 1991-07-03T22:36:37.17 10.0 undecidable manual PG 146 0.0071 -0.55 0.9
--.MNS.Z. 1991-07-03T22:36:34.24 10.0 undecidable manual PG 188 0.0057 -0.59 0.9
--.ALP.Z. 1991-07-03T22:36:33.64 10.0 undecidable manual PG 112 0.0054 -0.59 0.9
--.SSO.Z. 1991-07-03T22:36:32.84 10.0 undecidable manual PG 57 0.0047 0.09 1.7
--.CIO.Z. 1991-07-03T22:36:32.58 10.0 undecidable manual SG 53 0.0027 -0.52 0.4
--.ARV.Z. 1991-07-03T22:36:31.53 10.0 positive manual PG 11 0.0044 -0.61 1.8
--.RMF.Z. 1991-07-03T22:36:31.90 10.0 undecidable manual SG 101 0.0027 -1.08 0.1
--.RMF.Z. 1991-07-03T22:36:28.25 10.0 negative manual PG 101 0.0027 0.22 3.2
--.CIO.Z. 1991-07-03T22:36:28.40 10.0 negative manual PG 53 0.0027 0.3 3
--.ASS.Z. 1991-07-03T22:36:25.76 10.0 undecidable manual SG 292 0.0011 -0.43 0.5
--.ASS.Z. 1991-07-03T22:36:24.41 10.0 positive manual PG 292 0.0011 0.29 3
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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