ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of Md 2.8 on date 02-12-1985 and time 02:53:40 (Italy) in region 5 km N Palazzuolo sul Senio (FI)

A magnitude Md 2.8 earthquake occured in region: 5 km N Palazzuolo sul Senio (FI), on

  • 02-12-1985 01:53:40 (UTC)
  • 02-12-1985 02:53:40 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.16, 11.55 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
Palazzuolo sul Senio FI 5 1154 1154
Castel del Rio BO 7 1246 2400
Casola Valsenio RA 9 2617 5017
Marradi FI 11 3139 8156
Fontanelice BO 11 1943 10099
Borgo Tossignano BO 13 3288 13387
Firenzuola FI 14 4726 18113
Casalfiumanese BO 16 3438 21551
Tredozio FC 18 1212 22763
Brisighella RA 19 7639 30402
Riolo Terme RA 19 5720 36122
Modigliana FC 19 4560 40682
Monghidoro BO 20 3749 44431

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km SW of Imola (69797 inhabitants)
30 Km W of Faenza (58541 inhabitants)
40 Km W of Forlì (117913 inhabitants)
41 Km SE of Bologna (386663 inhabitants)
48 Km NE of Prato (191150 inhabitants)
49 Km NE of Firenze (382808 inhabitants)
54 Km NE of Scandicci (50609 inhabitants)
55 Km W of Cesena (96758 inhabitants)
56 Km E of Pistoia (90315 inhabitants)
59 Km W of Ravenna (159116 inhabitants)
73 Km SE of Modena (184973 inhabitants)
75 Km S of Ferrara (133155 inhabitants)
82 Km NW of Arezzo (99543 inhabitants)
82 Km W of Rimini (147750 inhabitants)
87 Km SE of Carpi (70699 inhabitants)
91 Km E of Lucca (89046 inhabitants)
94 Km SE of Reggio nell'Emilia (171345 inhabitants)
95 Km N of Siena (53903 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 2.8 1985-12-02
01:53:40
44.16 11.55 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 17219
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-12-02 01:53:40 ± 0.253
Latitude 44.16 ± 0.02
Longitude 11.55 ± 0.03
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 17219

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) 3708.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 89
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
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) 0.00397
Epicentral distance of station farthest from the epicenter (degree) 0.02412
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

Md:2.8

Field Value
Value 2.8
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 17219
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:20:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.RBL.Z. 1985-12-02T01:54:25.00 10.0 undecidable manual PN 30 0.0241 0.34 1.1
--.FO1.Z. 1985-12-02T01:54:24.00 10.0 undecidable manual PN 18 0.0232 0.76 0.8
--.FIN.Z. 1985-12-02T01:54:21.10 10.0 undecidable manual PN 272 0.0215 0.41 1.1
--.TRI.Z. 1985-12-02T01:54:17.00 10.0 undecidable manual PN 44 0.0198 -1.04 0.6
--.MNS.Z. 1985-12-02T01:54:15.00 10.0 undecidable manual PN 154 0.0176 0.32 1.3
--.CTI.Z. 1985-12-02T01:54:13.50 10.0 undecidable manual PN 1 0.0169 -0.22 1.4
--.ASS.Z. 1985-12-02T01:54:08.00 10.0 undecidable manual PN 143 0.0121 1.55 0.2
--.ARV.Z. 1985-12-02T01:54:03.00 10.0 undecidable manual PN 122 0.0108 -1.33 0.4
--.PS9.Z. 1985-12-02T01:53:58.00 10.0 undecidable manual PG 239 0.0077 -0.56 1.2
--.BDI.Z. 1985-12-02T01:53:55.50 10.0 undecidable manual PG 261 0.0062 0.06 1.6
--.FIR.Z. 1985-12-02T01:53:50.50 10.0 undecidable manual PG 208 0.004 -0.31 1.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download