Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.3 on date 10-08-1991 and time 19:11:56 (Italy) in region 3 km W Solarolo (RA)

A magnitude Md 2.3 earthquake occured in region: 3 km W Solarolo (RA), on

  • 10-08-1991 17:11:56 (UTC)
  • 10-08-1991 19:11:56 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.3540, 11.8030 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.

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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
Solarolo RA 3 4488 4488
Castel Bolognese RA 4 9554 14042
Bagnara di Romagna RA 4 2429 16471
Mordano BO 5 4760 21231
Imola BO 7 69797 91028
Faenza RA 10 58541 149569
Riolo Terme RA 11 5720 155289
Massa Lombarda RA 11 10653 165942
Sant'Agata sul Santerno RA 11 2862 168804
Lugo RA 12 32390 201194
Cotignola RA 12 7474 208668
Castel Guelfo di Bologna BO 13 4455 213123
Dozza BO 14 6652 219775
Brisighella RA 15 7639 227414
Bagnacavallo RA 16 16739 244153
Casalfiumanese BO 16 3438 247591
Castel San Pietro Terme BO 18 20811 268402
Conselice RA 18 9856 278258
Fusignano RA 18 8222 286480
Russi RA 19 12247 298727
Medicina BO 19 16739 315466
Borgo Tossignano BO 19 3288 318754

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km E of Imola (69797 inhabitants)
10 Km NW of Faenza (58541 inhabitants)
24 Km NW of Forlì (117913 inhabitants)
32 Km W of Ravenna (159116 inhabitants)
40 Km E of Bologna (386663 inhabitants)
43 Km NW of Cesena (96758 inhabitants)
56 Km S of Ferrara (133155 inhabitants)
69 Km W of Rimini (147750 inhabitants)
77 Km E of Modena (184973 inhabitants)
77 Km NE of Prato (191150 inhabitants)
78 Km NE of Firenze (382808 inhabitants)
80 Km S of Rovigo (51867 inhabitants)
83 Km NE of Scandicci (50609 inhabitants)
85 Km NE of Pistoia (90315 inhabitants)
87 Km SE of Carpi (70699 inhabitants)
99 Km N of Arezzo (99543 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 2.3
ML-VAX 2.0 		1991-08-10
17:11:56		 44.354 11.803 10 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 147279
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1991-08-10 17:11:56 ± 1.231
Latitude 44.3540 ± 0.0605
Longitude 11.8030 ± 0.0776
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 147279

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) 9129.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 272
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) 0.00405
Epicentral distance of station farthest from the epicenter (degree) 0.00818
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:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 5
Type of magnitude Md
Reference to an origin 147279
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:17:28

ML:2.0

Field Value
Value 2.0
Uncertainty
Num. used stations 2
Type of magnitude ML
Reference to an origin 147279
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
--.BDI.Z. 1991-08-10T17:12:29.00 10.0 undecidable manual SG 251 0.9102 1.35 0.1
--.CRE.Z. 1991-08-10T17:12:23.00 10.0 undecidable manual SG 171 0.7326 0.8 0.3
--.MME.Z. 1991-08-10T17:12:22.80 10.0 undecidable manual SG 258 0.7992 -1.44 0
--.BDI.Z. 1991-08-10T17:12:14.82 10.0 undecidable manual PG 251 0.9102 0.34 1.5
--.SFI.Z. 1991-08-10T17:12:13.34 10.0 undecidable manual SG 175 0.444 0.48 0.6
--.MME.Z. 1991-08-10T17:12:12.43 10.0 undecidable manual PG 258 0.7992 -0.08 1.8
--.PGD.Z. 1991-08-10T17:12:12.69 10.0 undecidable manual SG 187 0.4773 -1.17 0.1
--.CRE.Z. 1991-08-10T17:12:11.00 10.0 undecidable manual PG 171 0.7326 -0.33 1.6
--.PGD.Z. 1991-08-10T17:12:06.54 10.0 undecidable manual PG 187 0.4773 0.02 2
--.SFI.Z. 1991-08-10T17:12:05.97 10.0 undecidable manual PG 175 0.444 0.03 2
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