Earthquake with magnitude of Md 2.9 on date 06-01-1987 and time 16:48:22 (Italy) in region 8 km SW Premilcuore (FC)

A magnitude Md 2.9 earthquake occured in region: 8 km SW Premilcuore (FC), on

  • 06-01-1987 15:48:22 (UTC)
  • 06-01-1987 16:48:22 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.92, 11.73 at 9 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
Premilcuore FC 8 799 799
San Godenzo FI 9 1167 1966
Portico e San Benedetto FC 13 756 2722
Pratovecchio Stia AR 14 5845 8567
Londa FI 14 1840 10407
Santa Sofia FC 15 4136 14543
Dicomano FI 17 5515 20058
Galeata FC 17 2516 22574
Tredozio FC 18 1212 23786
Rocca San Casciano FC 18 1910 25696
Civitella di Romagna FC 20 3786 29482
Castel San Niccolò AR 20 2707 32189
Marradi FI 20 3139 35328

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km E of Firenze (382808 inhabitants)
42 Km SW of Forlì (117913 inhabitants)
43 Km SW of Faenza (58541 inhabitants)
47 Km E of Scandicci (50609 inhabitants)
48 Km SW of Cesena (96758 inhabitants)
49 Km S of Imola (69797 inhabitants)
51 Km E of Prato (191150 inhabitants)
52 Km N of Arezzo (99543 inhabitants)
65 Km E of Pistoia (90315 inhabitants)
67 Km SW of Ravenna (159116 inhabitants)
69 Km W of Rimini (147750 inhabitants)
71 Km SE of Bologna (386663 inhabitants)
74 Km NE of Siena (53903 inhabitants)
95 Km W of Pesaro (94582 inhabitants)
99 Km E of Lucca (89046 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 2.9 1987-01-06
15:48:22
43.92 11.73 9 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 38939
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-01-06 15:48:22 ± 0.354
Latitude 43.92 ± 0.03
Longitude 11.73 ± 0.03
Depth (km) 9 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 38939

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) 4551.7
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 105
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
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) 0.00089
Epicentral distance of station farthest from the epicenter (degree) 0.02493
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

Md:2.9

Field Value
Value 2.9
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 38939
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:38:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.FO1.Z. 1987-01-06T15:49:39.50 10.0 undecidable manual SN 15 0.0249 0.55 0.3
--.CTI.Z. 1987-01-06T15:49:23.00 10.0 undecidable manual SN 358 0.0191 -0.61 0.4
--.FO1.Z. 1987-01-06T15:49:07.00 10.0 undecidable manual PN 15 0.0249 0.49 0.9
--.ASS.Z. 1987-01-06T15:48:57.00 10.0 undecidable manual SN 141 0.0097 -1.77 0.1
--.CTI.Z. 1987-01-06T15:48:57.00 10.0 undecidable manual PN 358 0.0191 -0.66 0.9
--.CO9.Z. 1987-01-06T15:48:55.00 10.0 undecidable manual PN 298 0.0165 1.34 0.3
--.BDI.Z. 1987-01-06T15:48:49.00 10.0 undecidable manual SG 280 0.0074 -1.88 0
--.ASS.Z. 1987-01-06T15:48:44.00 10.0 undecidable manual PN 141 0.0097 0.68 1.2
--.BDI.Z. 1987-01-06T15:48:38.00 10.0 undecidable manual PG 280 0.0074 -0.76 1.1
--.FIR.N. 1987-01-06T15:48:37.00 10.0 undecidable manual SG 247 0.0033 0.76 0.4
--.FIR.Z. 1987-01-06T15:48:30.50 10.0 positive manual PG 247 0.0033 0.19 3.4
--.MF9.Z. 1987-01-06T15:48:27.50 10.0 undecidable manual SG 113 0.0009 0.13 0.7
--.MF9.Z. 1987-01-06T15:48:25.00 10.0 negative manual PG 113 0.0009 -0.18 3.4
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
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