Earthquake with magnitude of Md 2.0 on date 31-07-1991 and time 01:57:04 (UTC) in region 1 km W Pieve Torina (MC)

A magnitude Md 2.0 earthquake occured in region: 1 km W Pieve Torina (MC), on

  • 31-07-1991 01:57:04 (UTC)
  • 31-07-1991 03:57:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.05, 13.04 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
Pieve Torina MC 1 1458 1458
Muccia MC 4 915 2373
Pievebovigliana MC 4 866 3239
Fiordimonte MC 5 202 3441
Monte Cavallo MC 6 145 3586
Serravalle di Chienti MC 7 1070 4656
Fiastra MC 10 559 5215
Camerino MC 10 6974 12189
Acquacanina MC 12 121 12310
Sefro MC 13 422 12732
Visso MC 13 1107 13839
Ussita MC 14 444 14283
Pioraco MC 15 1134 15417
Bolognola MC 17 142 15559
Fiuminata MC 18 1402 16961
Castelraimondo MC 18 4587 21548
Preci PG 19 724 22272
Caldarola MC 19 1823 24095
Serrapetrona MC 19 966 25061
Castelsantangelo sul Nera MC 19 281 25342
Cessapalombo MC 20 512 25854
Sellano PG 20 1079 26933

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km E of Foligno (57155 inhabitants)
53 Km E of Perugia (166134 inhabitants)
63 Km NE of Terni (111501 inhabitants)
69 Km NW of Teramo (54892 inhabitants)
75 Km SW of Ancona (100861 inhabitants)
83 Km NW of L'Aquila (69753 inhabitants)
89 Km S of Fano (60888 inhabitants)
97 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 2.0 1991-07-31
01:57:04
43.05 13.04 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 146549
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-07-31 01:57:04 ± 0.174
Latitude 43.05 ± 0.01
Longitude 13.04 ± 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 146549

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) 1836.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 147
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00138
Epicentral distance of station farthest from the epicenter (degree) 0.00405
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

Md:2

Field Value
Value 2
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 146549
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:16:47
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1991-07-31T01:57:21.98 10.0 undecidable manual SG 351 0.004 0.77 0.1
--.ASS.Z. 1991-07-31T01:57:15.35 10.0 undecidable manual SG 273 0.0025 -0.18 0.7
--.ARV.Z. 1991-07-31T01:57:14.80 10.0 undecidable manual PG 351 0.004 -0.12 1.4
--.RMF.Z. 1991-07-31T01:57:11.19 10.0 undecidable manual SG 126 0.0014 -0.38 0.5
--.CIO.Z. 1991-07-31T01:57:11.50 10.0 undecidable manual SG 28 0.0015 -0.88 0
--.ASS.Z. 1991-07-31T01:57:10.82 10.0 undecidable manual PG 273 0.0025 -0.1 1.9
--.CIO.Z. 1991-07-31T01:57:09.20 10.0 undecidable manual PG 28 0.0015 0.18 1.8
--.RMF.Z. 1991-07-31T01:57:08.93 10.0 undecidable manual PG 126 0.0014 0.3 1.5
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download