Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 21-12-2020 and time 07:08:18 (Italy) in region 2 km NE Scandicci (FI)

A magnitude ML 1.4 earthquake occured in region: 2 km NE Scandicci (FI), on

  • 21-12-2020 06:08:18 (UTC)
  • 21-12-2020 07:08:18 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.7710, 11.2000 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Scandicci FI 2 50609 50609
Firenze FI 5 382808 433417
Sesto Fiorentino FI 7 48958 482375
Lastra a Signa FI 7 20156 502531
Campi Bisenzio FI 8 46166 548697
Signa FI 8 19179 567876
Fiesole FI 9 13969 581845
Bagno a Ripoli FI 10 25611 607456
Impruneta FI 10 14615 622071
Calenzano FI 11 17489 639560
San Casciano in Val di Pesa FI 13 17062 656622
Poggio a Caiano PO 13 10007 666629
Prato PO 15 191150 857779
Montelupo Fiorentino FI 15 14098 871877
Carmignano PO 15 14450 886327
Vaglia FI 17 5073 891400
Montespertoli FI 17 13537 904937
Capraia e Limite FI 18 7670 912607
Pontassieve FI 19 20603 933210
Quarrata PT 20 26190 959400

Municipalities with at least 50000 inhabitants

An earthquake occurred to
2 Km NE of Scandicci (50609 inhabitants)
5 Km W of Firenze (382808 inhabitants)
15 Km SE of Prato (191150 inhabitants)
29 Km SE of Pistoia (90315 inhabitants)
51 Km N of Siena (53903 inhabitants)
57 Km E of Lucca (89046 inhabitants)
64 Km E of Pisa (89158 inhabitants)
65 Km NW of Arezzo (99543 inhabitants)
76 Km E of Livorno (159219 inhabitants)
77 Km SW of Imola (69797 inhabitants)
77 Km E of Viareggio (62467 inhabitants)
79 Km SW of Faenza (58541 inhabitants)
81 Km S of Bologna (386663 inhabitants)
84 Km SW of Forlì (117913 inhabitants)
90 Km E of Massa (69479 inhabitants)
93 Km W of Cesena (96758 inhabitants)
95 Km E of Carrara (63133 inhabitants)
100 Km S of Modena (184973 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 		ML 1.4 2020-12-21
06:08:18		 43.7708 11.1997 9 2021-02-26
14:56:14		 Bollettino Sismico Italiano INGV 86123261
Reviewed
Rev100 		ML 1.6 2020-12-21
06:08:17		 43.7653 11.1958 9 2020-12-21
06:16:03		 Sala Sismica INGV-Roma 85594521
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-21 06:08:18 ± 0.07
Latitude 43.7708 ± 0.0036
Longitude 11.1997 ± 0.0050
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86123261

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 392
Semi-minor axis of confidence ellipse (meter) 342
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 356
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 111
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.48563
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 85594521
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-21 06:16:03

ML:1.4

Field Value
Value 1.4
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 86123261
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-09 15:39:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RAVA.EHZ. 2020-12-21T06:08:37.93 3.0 positive manual P 0.05 0
IV.SFI.EHN. 2020-12-21T06:08:35.43 1.0 undecidable manual S 74 53.9016 50 0.08 24
IV.ASQU.HHE. 2020-12-21T06:08:33.93 0.3 undecidable manual S 86 47.3193 50 0.33 69
IV.RINC.HHZ. 2020-12-21T06:08:30.36 0.3 undecidable manual S 68 35.0427 50 0.04 75
IV.CSNT.HHE. 2020-12-21T06:08:29.60 0.6 undecidable manual S 168 33.8439 50 -0.4 46
IV.RONT.HHZ. 2020-12-21T06:08:29.58 0.6 undecidable manual S 37 30.9468 106 0.36 47
IV.SEI.HHZ. 2020-12-21T06:08:29.76 0.3 undecidable manual S 22 33.9438 50 -0.26 72
IV.SFI.EHN. 2020-12-21T06:08:28.04 0.6 undecidable manual P 74 53.9016 50 0 49
IV.ASQU.HHE. 2020-12-21T06:08:27.26 1.0 undecidable manual P 86 47.3193 50 0.24 23
IV.RUFI.EHZ. 2020-12-21T06:08:27.08 0.6 undecidable manual S 73 25.9518 109 -0.47 46
IV.MOCL.EHE. 2020-12-21T06:08:27.46 0.6 undecidable manual S 357 26.0517 109 -0.12 50
IV.MPPT.EHE. 2020-12-21T06:08:26.24 0.3 undecidable manual S 337 22.4553 112 -0.19 74
IV.SEI.HHZ. 2020-12-21T06:08:25.00 0.1 positive manual P 22 33.9438 50 0.04 100
IV.CRMI.HNN. 2020-12-21T06:08:25.20 0.6 undecidable manual S 279 17.871 117 0.24 49
IV.RINC.HHZ. 2020-12-21T06:08:25.19 0.3 negative manual P 68 35.0427 50 0.06 75
IV.CSNT.HHE. 2020-12-21T06:08:24.79 0.3 undecidable manual P 168 33.8439 50 -0.15 73
IV.RONT.HHZ. 2020-12-21T06:08:24.82 0.6 positive manual P 37 30.9468 106 0.33 47
IV.RUFI.EHZ. 2020-12-21T06:08:23.54 1.0 undecidable manual P 73 25.9518 109 0.01 26
IV.MOCL.EHE. 2020-12-21T06:08:23.97 1.0 undecidable manual P 357 26.0517 109 0.42 23
IV.CRMI.HNN. 2020-12-21T06:08:22.23 0.3 undecidable manual P 279 17.871 117 0.2 75
IV.MPPT.EHE. 2020-12-21T06:08:22.64 0.1 undecidable manual P 337 22.4553 112 -0.24 98
IT.FIE.HGE. 2020-12-21T06:08:22.15 0.3 undecidable manual S 62 8.5803 136 -0.19 76
IV.FIR.HNZ. 2020-12-21T06:08:21.43 0.6 undecidable manual S 85 4.4955 153 -0.07 52
IV.FIR.HNZ. 2020-12-21T06:08:20.18 0.3 undecidable manual P 85 4.4955 153 0.14 77
IT.FIE.HGE. 2020-12-21T06:08:20.66 0.3 undecidable manual P 62 8.5803 136 0.14 77
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RONT.HHN. ML:2.2 0.000723229 0.1408 AML other m 2020-12-21T06:08:31.02
IV.RONT.HHE. ML:2.1 0.0006355269 0.1408 AML other m 2020-12-21T06:08:31.18
IV.SEI.HHN. ML:1.6 0.0001518582 0.16 AML other m 2020-12-21T06:08:30.92
IV.RINC.HHN. ML:1.0 0.00004710164 0.2592 AML other m 2020-12-21T06:08:31.16
IV.RINC.HHE. ML:1.4 0.00010065 0.18 AML other m 2020-12-21T06:08:31.60
IV.SEI.HHE. ML:1.4 0.000112 0.28 AML other m 2020-12-21T06:08:32.15
IV.RUFI.EHE. ML:1.0 0.00005424474 0.1792 AML other m 2020-12-21T06:08:27.89
IV.RUFI.EHN. ML:1.0 0.000059200747000000006 0.1984 AML other m 2020-12-21T06:08:27.85
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