Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.4 on date 20-02-1991 and time 19:58:10 (Italy) in region 6 km SE Faenza (RA)

A magnitude Md 2.4 earthquake occured in region: 6 km SE Faenza (RA), on

  • 20-02-1991 18:58:10 (UTC)
  • 20-02-1991 19:58:10 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.2570, 11.9490 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Faenza RA 6 58541 58541
Forlì FC 8 117913 176454
Castrocaro Terme e Terra del Sole FC 9 6426 182880
Castel Bolognese RA 14 9554 192434
Solarolo RA 14 4488 196922
Cotignola RA 14 7474 204396
Russi RA 15 12247 216643
Brisighella RA 15 7639 224282
Dovadola FC 16 1653 225935
Forlimpopoli FC 16 13290 239225
Modigliana FC 17 4560 243785
Meldola FC 17 9970 253755
Predappio FC 17 6346 260101
Bagnara di Romagna RA 18 2429 262530
Riolo Terme RA 18 5720 268250
Bagnacavallo RA 18 16739 284989
Lugo RA 19 32390 317379
Bertinoro FC 19 11059 328438
Mordano BO 19 4760 333198

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km SE of Faenza (58541 inhabitants)
8 Km W of Forlì (117913 inhabitants)
22 Km SE of Imola (69797 inhabitants)
27 Km SW of Ravenna (159116 inhabitants)
27 Km W of Cesena (96758 inhabitants)
54 Km W of Rimini (147750 inhabitants)
55 Km E of Bologna (386663 inhabitants)
70 Km SE of Ferrara (133155 inhabitants)
77 Km NE of Firenze (382808 inhabitants)
80 Km NE of Prato (191150 inhabitants)
83 Km NE of Scandicci (50609 inhabitants)
86 Km W of Pesaro (94582 inhabitants)
88 Km N of Arezzo (99543 inhabitants)
90 Km E of Pistoia (90315 inhabitants)
92 Km S of Rovigo (51867 inhabitants)
92 Km E of Modena (184973 inhabitants)
97 Km W of Fano (60888 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 2.4
ML-VAX 1.7 		1991-02-20
18:58:10		 44.257 11.949 5 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 136269
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-02-20 18:58:10 ± 0.262
Latitude 44.2570 ± 0.0109
Longitude 11.9490 ± 0.0217
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 136269

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) 2110.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 166
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
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) 0.00324
Epicentral distance of station farthest from the epicenter (degree) 0.02161
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 136269
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:07:03

ML:1.7

Field Value
Value 1.7
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 136269
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(km) Takeoff_angle Residual Weight
--.FVI.Z. 1991-02-20T18:59:19.38 10.0 undecidable manual SN 13 2.3976 -0.32 0.4
--.FVI.Z. 1991-02-20T18:58:51.00 10.0 undecidable manual PN 13 2.3976 0.49 0.6
--.BDI.Z. 1991-02-20T18:58:45.00 10.0 undecidable manual SG 259 0.9768 -0.23 0.7
--.CRE.Z. 1991-02-20T18:58:34.00 10.0 undecidable manual SG 179 0.6327 0.04 0.8
--.BDI.Z. 1991-02-20T18:58:30.87 10.0 undecidable manual PG 259 0.9768 0.26 1.7
--.MME.Z. 1991-02-20T18:58:28.64 10.0 undecidable manual PG 266 0.888 -0.27 1.7
--.PGD.Z. 1991-02-20T18:58:27.98 10.0 undecidable manual SG 203 0.4107 1.25 0
--.SFI.Z. 1991-02-20T18:58:25.00 10.0 undecidable manual SG 191 0.3552 0.38 0.6
--.CRE.Z. 1991-02-20T18:58:24.00 10.0 undecidable manual PG 179 0.6327 -0.1 2
--.PGD.Z. 1991-02-20T18:58:19.28 10.0 undecidable manual PG 203 0.4107 -0.64 0.7
--.SFI.Z. 1991-02-20T18:58:18.42 10.0 undecidable manual PG 191 0.3552 -0.29 1.7
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download