Earthquake with magnitude of Md 2.4 on date 04-10-1986 and time 12:41:11 (Italy) in region 7 km NE Firenzuola (FI)

A magnitude Md 2.4 earthquake occured in region: 7 km NE Firenzuola (FI), on

  • 04-10-1986 11:41:11 (UTC)
  • 04-10-1986 12:41:11 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.18, 11.41 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Firenzuola FI 7 4726 4726
Castel del Rio BO 9 1246 5972
Monghidoro BO 9 3749 9721
Loiano BO 13 4294 14015
Palazzuolo sul Senio FI 13 1154 15169
San Benedetto Val di Sambro BO 15 4315 19484
Fontanelice BO 15 1943 21427
Monzuno BO 16 6328 27755
Monterenzio BO 17 6035 33790
Casola Valsenio RA 18 2617 36407
Borgo Tossignano BO 18 3288 39695
Marradi FI 20 3139 42834

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SW of Imola (69797 inhabitants)
36 Km S of Bologna (386663 inhabitants)
40 Km W of Faenza (58541 inhabitants)
41 Km NE of Prato (191150 inhabitants)
47 Km N of Firenze (382808 inhabitants)
48 Km NE of Pistoia (90315 inhabitants)
50 Km NE of Scandicci (50609 inhabitants)
51 Km W of Forlì (117913 inhabitants)
65 Km SE of Modena (184973 inhabitants)
67 Km W of Cesena (96758 inhabitants)
68 Km W of Ravenna (159116 inhabitants)
75 Km S of Ferrara (133155 inhabitants)
79 Km SE of Carpi (70699 inhabitants)
82 Km E of Lucca (89046 inhabitants)
85 Km SE of Reggio nell'Emilia (171345 inhabitants)
88 Km NW of Arezzo (99543 inhabitants)
93 Km W of Rimini (147750 inhabitants)
96 Km NE of Pisa (89158 inhabitants)
96 Km N of Siena (53903 inhabitants)
99 Km E of Viareggio (62467 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 2.4 1986-10-04
11:41:11
44.18 11.41 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 35269
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1986-10-04 11:41:11 ± 0.546
Latitude 44.18 ± 0.04
Longitude 11.41 ± 0.02
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 35269

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) 4410.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 241
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 7
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) 0.00534
Epicentral distance of station farthest from the epicenter (degree) 0.01287
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:2.4

Field Value
Value 2.4
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 35269
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:35:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.PS9.Z. 1986-10-04T11:41:40.00 10.0 undecidable manual SG 234 0.007 -0.03 0.9
--.ASS.Z. 1986-10-04T11:41:39.00 10.0 undecidable manual PN 140 0.0129 0.53 1.1
--.CRE.Z. 1986-10-04T11:41:36.70 10.0 undecidable manual SG 144 0.0061 0.01 0.9
--.BDI.Z. 1986-10-04T11:41:33.00 10.0 undecidable manual SG 258 0.0053 -0.94 0.2
--.PS9.Z. 1986-10-04T11:41:29.00 10.0 undecidable manual PG 234 0.007 0.83 0.9
--.CRE.Z. 1986-10-04T11:41:25.50 10.0 undecidable manual PG 144 0.0061 -0.74 1
--.BDI.Z. 1986-10-04T11:41:24.50 10.0 undecidable manual PG 258 0.0053 -0.15 2.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
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