Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 2.4 on date 18-12-1990 and time 18:18:10 (Italy) in region 6 km SW Castel del Rio (BO)

A magnitude Md 2.4 earthquake occured in region: 6 km SW Castel del Rio (BO), on

  • 18-12-1990 17:18:10 (UTC)
  • 18-12-1990 18:18:10 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1770, 11.4480 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
Castel del Rio BO 6 1246 1246
Firenzuola FI 9 4726 5972
Palazzuolo sul Senio FI 11 1154 7126
Monghidoro BO 12 3749 10875
Fontanelice BO 13 1943 12818
Loiano BO 15 4294 17112
Casola Valsenio RA 15 2617 19729
Borgo Tossignano BO 16 3288 23017
Monterenzio BO 17 6035 29052
Marradi FI 17 3139 32191
San Benedetto Val di Sambro BO 18 4315 36506
Monzuno BO 18 6328 42834
Casalfiumanese BO 19 3438 46272

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SW of Imola (69797 inhabitants)
36 Km S of Bologna (386663 inhabitants)
37 Km W of Faenza (58541 inhabitants)
43 Km NE of Prato (191150 inhabitants)
48 Km W of Forlì (117913 inhabitants)
48 Km NE of Firenze (382808 inhabitants)
50 Km NE of Pistoia (90315 inhabitants)
51 Km NE of Scandicci (50609 inhabitants)
64 Km W of Cesena (96758 inhabitants)
66 Km W of Ravenna (159116 inhabitants)
67 Km SE of Modena (184973 inhabitants)
75 Km S of Ferrara (133155 inhabitants)
81 Km SE of Carpi (70699 inhabitants)
84 Km E of Lucca (89046 inhabitants)
86 Km NW of Arezzo (99543 inhabitants)
87 Km SE of Reggio nell'Emilia (171345 inhabitants)
90 Km W of Rimini (147750 inhabitants)
96 Km N of Siena (53903 inhabitants)
98 Km NE of Pisa (89158 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 2.1 		1990-12-18
17:18:10		 44.177 11.448 10 2013-07-15
08:41:04		 Bollettino Sismico Italiano INGV 132689
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1990-12-18 17:18:10 ± 0.551
Latitude 44.1770 ± 0.0457
Longitude 11.4480 ± 0.0306
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 132689

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) 5634.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 221
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00316
Epicentral distance of station farthest from the epicenter (degree) 0.00720
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

Md:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 132689
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 19:03:37

ML:2.1

Field Value
Value 2.1
Uncertainty
Num. used stations 2
Type of magnitude ML
Reference to an origin 132689
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
--.PII.Z. 1990-12-18T17:18:36.53 10.0 undecidable manual SG 236 0.7992 -1.35 0.1
--.CRE.Z. 1990-12-18T17:18:33.71 10.0 undecidable manual SG 146 0.6549 0.38 0.6
--.BDI.Z. 1990-12-18T17:18:32.18 10.0 undecidable manual SG 259 0.6216 0.23 0.7
--.MME.Z. 1990-12-18T17:18:30.51 10.0 undecidable manual SG 272 0.5328 1.28 0.1
--.PII.Z. 1990-12-18T17:18:27.40 10.0 undecidable manual PG 236 0.7992 0.9 0.6
--.SR3.E. 1990-12-18T17:18:26.00 10.0 undecidable manual SG 136 0.3996 0.97 0.2
--.SFI.Z. 1990-12-18T17:18:25.14 10.0 undecidable manual SG 133 0.3996 0.43 0.6
--.PGD.Z. 1990-12-18T17:18:23.24 10.0 undecidable manual SG 147 0.3552 -0.32 0.7
--.CRE.Z. 1990-12-18T17:18:23.35 10.0 undecidable manual PG 146 0.6549 -0.16 1.7
--.BDI.Z. 1990-12-18T17:18:22.70 10.0 undecidable manual PG 259 0.6216 -0.64 1.1
--.MME.Z. 1990-12-18T17:18:21.00 10.0 undecidable manual PG 272 0.5328 -0.14 1.9
--.SR3.Z. 1990-12-18T17:18:19.00 10.0 negative manual PG 136 0.3996 0.28 3.5
--.PGD.Z. 1990-12-18T17:18:17.39 10.0 undecidable manual PG 147 0.3552 -0.48 1.5
--.SFI.Z. 1990-12-18T17:18:17.64 10.0 undecidable manual PG 133 0.3996 -0.89 0.7
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