Earthquake with magnitude of Md 2.0 on date 04-02-1991 and time 17:15:57 (Italy) in region 1 km NW Acqualagna (PU)

A magnitude Md 2.0 earthquake occured in region: 1 km NW Acqualagna (PU), on

  • 04-02-1991 16:15:57 (UTC)
  • 04-02-1991 17:15:57 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.63, 12.67 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
Acqualagna PU 1 4393 4393
Fermignano PU 6 8596 12989
Cagli PU 9 8731 21720
Urbino PU 11 15019 36739
Urbania PU 13 7099 43838
Fossombrone PU 13 9575 53413
Piobbico PU 13 2029 55442
Frontone PU 14 1300 56742
Pergola PU 15 6333 63075
Isola del Piano PU 16 594 63669
Peglio PU 16 696 64365
Cantiano PU 17 2245 66610
Serra Sant'Abbondio PU 17 1027 67637
Sant'Ippolito PU 18 1563 69200
Montefelcino PU 18 2671 71871
Petriano PU 18 2829 74700
Fratte Rosa PU 19 966 75666

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km SW of Fano (60888 inhabitants)
37 Km SW of Pesaro (94582 inhabitants)
49 Km S of Rimini (147750 inhabitants)
62 Km NE of Perugia (166134 inhabitants)
66 Km E of Arezzo (99543 inhabitants)
66 Km SE of Cesena (96758 inhabitants)
69 Km W of Ancona (100861 inhabitants)
75 Km N of Foligno (57155 inhabitants)
83 Km SE of Forlì (117913 inhabitants)
96 Km SE of Ravenna (159116 inhabitants)
97 Km SE of Faenza (58541 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 2.0 1991-02-04
16:15:57
43.63 12.67 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 135409
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-02-04 16:15:57 ± 0.416
Latitude 43.63 ± 0.05
Longitude 12.67 ± 0.04
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 135409

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) 6382.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 187
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) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.0021
Epicentral distance of station farthest from the epicenter (degree) 0.00583
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 135409
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:06:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SFI.Z. 1991-02-04T16:16:20.00 10.0 undecidable manual SG 295 0.0058 -0.03 0.6
--.CRE.Z. 1991-02-04T16:16:16.50 10.0 undecidable manual SG 269 0.0046 0.8 0.3
--.ASS.Z. 1991-02-04T16:16:15.50 10.0 undecidable manual SG 181 0.005 -1.63 0
--.SFI.Z. 1991-02-04T16:16:10.00 10.0 undecidable manual PG 295 0.0058 -0.34 1.3
--.ASS.Z. 1991-02-04T16:16:09.50 10.0 undecidable manual PG 181 0.005 0.83 0.8
--.ARV.Z. 1991-02-04T16:16:08.00 10.0 undecidable manual SG 122 0.0021 1.36 0.1
--.CRE.Z. 1991-02-04T16:16:07.84 10.0 undecidable manual PG 269 0.0046 0 1.7
--.ARV.Z. 1991-02-04T16:16:02.27 10.0 positive manual PG 122 0.0021 -0.34 3.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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