Earthquake with magnitude of Md 2.2 on date 07-11-1987 and time 18:27:29 (UTC) in region 4 km N Firenzuola (FI)

A magnitude Md 2.2 earthquake occured in region: 4 km N Firenzuola (FI), on

  • 07-11-1987 18:27:29 (UTC)
  • 07-11-1987 19:27:29 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.1540, 11.3780 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 4 4726 4726
Monghidoro BO 9 3749 8475
Castel del Rio BO 12 1246 9721
San Benedetto Val di Sambro BO 13 4315 14036
Loiano BO 14 4294 18330
Palazzuolo sul Senio FI 14 1154 19484
Monzuno BO 16 6328 25812
Castiglione dei Pepoli BO 18 5648 31460
Fontanelice BO 19 1943 33403
Monterenzio BO 19 6035 39438

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km SW of Imola (69797 inhabitants)
38 Km NE of Prato (191150 inhabitants)
38 Km S of Bologna (386663 inhabitants)
43 Km W of Faenza (58541 inhabitants)
44 Km N of Firenze (382808 inhabitants)
44 Km NE of Pistoia (90315 inhabitants)
47 Km NE of Scandicci (50609 inhabitants)
54 Km W of Forlì (117913 inhabitants)
66 Km SE of Modena (184973 inhabitants)
69 Km W of Cesena (96758 inhabitants)
72 Km W of Ravenna (159116 inhabitants)
78 Km E of Lucca (89046 inhabitants)
78 Km S of Ferrara (133155 inhabitants)
80 Km SE of Carpi (70699 inhabitants)
85 Km SE of Reggio nell'Emilia (171345 inhabitants)
86 Km NW of Arezzo (99543 inhabitants)
92 Km NE of Pisa (89158 inhabitants)
93 Km N of Siena (53903 inhabitants)
95 Km W of Rimini (147750 inhabitants)
96 Km E of Viareggio (62467 inhabitants)
100 Km E of Massa (69479 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 2.2
ML-VAX 1.5
1987-11-07
18:27:29
44.154 11.378 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 58239
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-11-07 18:27:29 ± 0.329
Latitude 44.1540 ± 0.0264
Longitude 11.3780 ± 0.0151
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 58239

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) 3171.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 209
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
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) 0.00332
Epicentral distance of station farthest from the epicenter (degree) 0.00672
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:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 58239
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:55:45

ML:1.5

Field Value
Value 1.5
Uncertainty
Num. used stations 3
Type of magnitude ML
Reference to an origin 58239
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. 1987-11-07T18:27:55.59 10.0 undecidable manual SG 235 0.7437 -0.36 0.5
--.CRE.Z. 1987-11-07T18:27:53.66 10.0 undecidable manual SG 142 0.6771 0.17 0.7
--.BDI.Z. 1987-11-07T18:27:50.10 10.0 undecidable manual SG 261 0.5661 0.05 0.8
--.MME.Z. 1987-11-07T18:27:46.25 10.0 undecidable manual SG 275 0.4884 -1.22 0
--.SS9.Z. 1987-11-07T18:27:45.44 10.0 undecidable manual SG 124 0.3996 0.37 0.6
--.PII.Z. 1987-11-07T18:27:44.95 10.0 undecidable manual PG 235 0.7437 0.01 1.8
--.PGD.Z. 1987-11-07T18:27:44.30 10.0 undecidable manual SG 138 0.3663 0.52 0.5
--.CRE.Z. 1987-11-07T18:27:42.96 10.0 undecidable manual PG 142 0.6771 -0.55 1
--.BDI.Z. 1987-11-07T18:27:42.32 10.0 undecidable manual PG 261 0.5661 0.78 0.5
--.MME.Z. 1987-11-07T18:27:40.23 10.0 undecidable manual PG 275 0.4884 0.18 2
--.PGD.Z. 1987-11-07T18:27:38.20 10.0 undecidable manual PG 138 0.3663 0.11 2
--.SS9.Z. 1987-11-07T18:27:38.29 10.0 undecidable manual PG 124 0.3996 -0.37 1.6
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download