Earthquake with magnitude of Md 2.1 on date 04-03-1991 and time 22:25:26 (Italy) in region 3 km NE Cerreto di Spoleto (PG)

A magnitude Md 2.1 earthquake occured in region: 3 km NE Cerreto di Spoleto (PG), on

  • 04-03-1991 21:25:26 (UTC)
  • 04-03-1991 22:25:26 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.84, 12.94 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
Cerreto di Spoleto PG 3 1075 1075
Sellano PG 5 1079 2154
Preci PG 9 724 2878
Vallo di Nera PG 10 364 3242
Campello sul Clitunno PG 14 2442 5684
Norcia PG 14 4957 10641
Poggiodomo PG 15 117 10758
Sant'Anatolia di Narco PG 15 564 11322
Cascia PG 15 3217 14539
Visso MC 16 1107 15646
Trevi PG 16 8469 24115
Scheggino PG 17 461 24576
Monte Cavallo MC 18 145 24721
Castelsantangelo sul Nera MC 18 281 25002
Ussita MC 20 444 25446

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SE of Foligno (57155 inhabitants)
40 Km NE of Terni (111501 inhabitants)
54 Km SE of Perugia (166134 inhabitants)
66 Km W of Teramo (54892 inhabitants)
66 Km NW of L'Aquila (69753 inhabitants)
83 Km NE of Viterbo (67173 inhabitants)
95 Km N of Guidonia Montecelio (88673 inhabitants)
98 Km SW of Ancona (100861 inhabitants)
99 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
Rev 1000 Md 2.1
M 2.2
1991-03-04
21:25:26
42.84 12.94 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 137089
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-03-04 21:25:26 ± 0.172
Latitude 42.84 ± 0.01
Longitude 12.94 ± 0.01
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 137089

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) 1604.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 113
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00267
Epicentral distance of station farthest from the epicenter (degree) 0.00583
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitudes information

Md:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 137089
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:07:49

M:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations
Type of magnitude M
Reference to an origin 137089
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 09:32:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1991-03-04T21:25:49.71 10.0 undecidable manual SG 359 0.0058 0.4 0.4
--.MNS.Z. 1991-03-04T21:25:43.35 10.0 undecidable manual SG 202 0.0045 -0.91 0.1
--.ALP.Z. 1991-03-04T21:25:43.33 10.0 undecidable manual SG 97 0.0041 0.16 1
--.CIO.Z. 1991-03-04T21:25:40.70 10.0 undecidable manual SG 22 0.0034 -0.45 0.6
--.ARV.Z. 1991-03-04T21:25:39.29 10.0 undecidable manual PG 359 0.0058 -0.34 1.1
--.ASS.Z. 1991-03-04T21:25:38.60 10.0 undecidable manual SG 315 0.0027 0.54 0.3
--.ALP.Z. 1991-03-04T21:25:36.60 10.0 undecidable manual PG 97 0.0041 0.53 0.7
--.MNS.Z. 1991-03-04T21:25:36.79 10.0 undecidable manual PG 202 0.0045 0.09 1.7
--.CIO.Z. 1991-03-04T21:25:34.30 10.0 undecidable manual PG 22 0.0034 -0.25 3
--.ASS.Z. 1991-03-04T21:25:33.51 10.0 undecidable manual PG 315 0.0027 0.38 1.2
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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