Earthquake with magnitude of Md 2.5 on date 05-02-1987 and time 16:30:26 (Italy) in region 7 km SE Firenzuola (FI)

A magnitude Md 2.5 earthquake occured in region: 7 km SE Firenzuola (FI), on

  • 05-02-1987 15:30:26 (UTC)
  • 05-02-1987 16:30:26 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.07, 11.432 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
Firenzuola FI 7 4726 4726
Palazzuolo sul Senio FI 11 1154 5880
Borgo San Lorenzo FI 13 18211 24091
Marradi FI 15 3139 27230
Scarperia e San Piero FI 15 12217 39447
Vicchio FI 15 8044 47491
Castel del Rio BO 17 1246 48737
Barberino di Mugello FI 17 10836 59573
Monghidoro BO 19 3749 63322

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km NE of Prato (191150 inhabitants)
36 Km NE of Firenze (382808 inhabitants)
39 Km SW of Imola (69797 inhabitants)
40 Km NE of Scandicci (50609 inhabitants)
43 Km SW of Faenza (58541 inhabitants)
44 Km E of Pistoia (90315 inhabitants)
48 Km S of Bologna (386663 inhabitants)
52 Km W of Forlì (117913 inhabitants)
65 Km W of Cesena (96758 inhabitants)
72 Km SW of Ravenna (159116 inhabitants)
76 Km SE of Modena (184973 inhabitants)
76 Km NW of Arezzo (99543 inhabitants)
79 Km E of Lucca (89046 inhabitants)
84 Km N of Siena (53903 inhabitants)
87 Km S of Ferrara (133155 inhabitants)
90 Km SE of Carpi (70699 inhabitants)
91 Km W of Rimini (147750 inhabitants)
91 Km E of Pisa (89158 inhabitants)
95 Km SE of Reggio nell'Emilia (171345 inhabitants)
97 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
Bulletin
Rev1000
Md 2.5 1987-02-05
15:30:26
44.07 11.432 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 40589
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-02-05 15:30:26 ± 0.422
Latitude 44.0700 ± 0.0409
Longitude 11.4320 ± 0.0412
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 40589

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) 5613.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 129
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 9
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.8
Epicentral distance of station closest to the epicenter (degree) 0.00526
Epicentral distance of station farthest from the epicenter (degree) 0.0242
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

Md:2.5

Field Value
Value 2.5
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 40589
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:40:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.FO1.Z. 1987-02-05T15:31:10.00 10.0 undecidable manual PN 20 0.0242 0.38 1.2
--.ARV.Z. 1987-02-05T15:31:09.00 10.0 undecidable manual SN 117 0.011 2.66 0
--.CTI.Z. 1987-02-05T15:30:59.00 10.0 undecidable manual PN 4 0.0178 -0.85 1.1
--.ARV.Z. 1987-02-05T15:30:50.00 10.0 undecidable manual PN 117 0.011 0.47 1.8
--.ASS.Z. 1987-02-05T15:30:49.50 10.0 undecidable manual PN 138 0.012 -1.52 0.8
--.BDI.Z. 1987-02-05T15:30:48.50 10.0 undecidable manual SG 269 0.0053 0.77 0.6
--.CRE.Z. 1987-02-05T15:30:48.00 10.0 undecidable manual SG 140 0.0053 0.73 0.7
--.BDI.Z. 1987-02-05T15:30:38.50 10.0 undecidable manual PG 269 0.0053 -0.29 1.9
--.CRE.Z. 1987-02-05T15:30:37.00 10.0 undecidable manual PG 140 0.0053 -1.52 0.8
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