ISTITUTO NAZIONALE DI GEOFISICA E VULCANOLOGIA

Earthquake with magnitude of Md 2.2 on date 07-01-1986 and time 19:03:34 (Italy) in region 4 km SW Lastra a Signa (FI)

A magnitude Md 2.2 earthquake occured in region: 4 km SW Lastra a Signa (FI), on

  • 07-01-1986 18:03:34 (UTC)
  • 07-01-1986 19:03:34 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.74, 11.07 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
Lastra a Signa FI 4 20156 20156
Montelupo Fiorentino FI 4 14098 34254
Signa FI 5 19179 53433
Capraia e Limite FI 8 7670 61103
Poggio a Caiano PO 8 10007 71110
Scandicci FI 9 50609 121719
Carmignano PO 9 14450 136169
Campi Bisenzio FI 10 46166 182335
Empoli FI 10 48109 230444
Montespertoli FI 11 13537 243981
Vinci FI 13 14604 258585
San Casciano in Val di Pesa FI 13 17062 275647
Quarrata PT 14 26190 301837
Sesto Fiorentino FI 14 48958 350795
Firenze FI 15 382808 733603
Prato PO 16 191150 924753
Cerreto Guidi FI 16 10870 935623
Calenzano FI 16 17489 953112
Impruneta FI 16 14615 967727
Lamporecchio PT 16 7508 975235
Castelfiorentino FI 17 17504 992739
Larciano PT 18 6394 999133
Agliana PT 19 17525 1016658
San Miniato PI 19 27934 1044592
Fiesole FI 19 13969 1058561
Bagno a Ripoli FI 20 25611 1084172

Municipalities with at least 50000 inhabitants

An earthquake occurred to
9 Km W of Scandicci (50609 inhabitants)
15 Km W of Firenze (382808 inhabitants)
16 Km S of Prato (191150 inhabitants)
25 Km SE of Pistoia (90315 inhabitants)
47 Km E of Lucca (89046 inhabitants)
52 Km NW of Siena (53903 inhabitants)
54 Km E of Pisa (89158 inhabitants)
65 Km E of Livorno (159219 inhabitants)
67 Km E of Viareggio (62467 inhabitants)
72 Km W of Arezzo (99543 inhabitants)
81 Km E of Massa (69479 inhabitants)
85 Km SW of Imola (69797 inhabitants)
86 Km S of Bologna (386663 inhabitants)
87 Km E of Carrara (63133 inhabitants)
89 Km SW of Faenza (58541 inhabitants)
94 Km SW of Forlì (117913 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 2.2 1986-01-07
18:03:34
43.74 11.07 10 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 19569
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1986-01-07 18:03:34 ± 0.23
Latitude 43.74 ± 0.03
Longitude 11.07 ± 0.03
Depth (km) 10 ± 13 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 19569

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) 4257.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 212
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00121
Epicentral distance of station farthest from the epicenter (degree) 0.00575
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2.2

Field Value
Value 2.2
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 19569
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:22:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.CRE.Z. 1986-01-07T18:03:57.00 10.0 undecidable manual SG 100 0.0057 -0.17 0.3
--.BDI.Z. 1986-01-07T18:03:51.50 10.0 undecidable manual SG 313 0.0042 0.02 0.7
--.CRE.Z. 1986-01-07T18:03:47.70 10.0 negative manual PG 100 0.0057 0.1 2.2
--.BDI.Z. 1986-01-07T18:03:44.30 10.0 undecidable manual PG 313 0.0042 -0.02 1.7
--.FIR.Z. 1986-01-07T18:03:41.00 10.0 undecidable manual SG 76 0.0012 0.21 0.1
--.FIR.Z. 1986-01-07T18:03:38.00 10.0 undecidable manual PG 76 0.0012 -0.14 0.9
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
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