Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 21-12-2020 and time 05:33:27 (Italy) in region 3 km NE Scandicci (FI)

A magnitude ML 2.0 earthquake occured in region: 3 km NE Scandicci (FI), on

  • 21-12-2020 04:33:27 (UTC)
  • 21-12-2020 05:33:27 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.7810, 11.1940 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 3 50609 50609
Firenze FI 5 382808 433417
Sesto Fiorentino FI 6 48958 482375
Campi Bisenzio FI 6 46166 528541
Lastra a Signa FI 7 20156 548697
Signa FI 8 19179 567876
Fiesole FI 9 13969 581845
Calenzano FI 10 17489 599334
Bagno a Ripoli FI 11 25611 624945
Impruneta FI 12 14615 639560
Poggio a Caiano PO 12 10007 649567
Prato PO 14 191150 840717
San Casciano in Val di Pesa FI 14 17062 857779
Carmignano PO 15 14450 872229
Montelupo Fiorentino FI 15 14098 886327
Vaglia FI 16 5073 891400
Capraia e Limite FI 18 7670 899070
Montespertoli FI 18 13537 912607
Quarrata PT 19 26190 938797
Pontassieve FI 20 20603 959400

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km NE of Scandicci (50609 inhabitants)
5 Km W of Firenze (382808 inhabitants)
14 Km SE of Prato (191150 inhabitants)
28 Km SE of Pistoia (90315 inhabitants)
53 Km N of Siena (53903 inhabitants)
56 Km E of Lucca (89046 inhabitants)
64 Km E of Pisa (89158 inhabitants)
66 Km NW of Arezzo (99543 inhabitants)
76 Km E of Livorno (159219 inhabitants)
76 Km SW of Imola (69797 inhabitants)
76 Km E of Viareggio (62467 inhabitants)
79 Km SW of Faenza (58541 inhabitants)
80 Km S of Bologna (386663 inhabitants)
84 Km SW of Forlì (117913 inhabitants)
89 Km E of Massa (69479 inhabitants)
93 Km W of Cesena (96758 inhabitants)
94 Km E of Carrara (63133 inhabitants)
99 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 2.0 2020-12-21
04:33:27		 43.7807 11.1937 9 2021-02-26
14:56:14		 Bollettino Sismico Italiano INGV 86122881
Reviewed
Rev100 		ML 2.0 2020-12-21
04:33:27		 43.7708 11.1963 9 2020-12-21
04:41:33		 Sala Sismica INGV-Roma 85594101
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-21 04:33:27 ± 0.08
Latitude 43.7807 ± 0.0045
Longitude 11.1937 ± 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 86122881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 431
Semi-minor axis of confidence ellipse (meter) 419
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 30
Circular confidence region, given by single value of horizontal uncertainty (meter) 430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 69
Number of associated phases, regardless of their use for origin computation 47
Number of defining phases 38
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.01803
Number of stations at which the event was observed 31
Number of stations from which data was used for origin computation 23
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.4
Num. used stations 46
Type of magnitude ML
Reference to an origin 86122881
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-27 19:34:05

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 51
Type of magnitude ML
Reference to an origin 85594101
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-21 04:41:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
CR.STON.BHZ. 2020-12-21T04:34:53.62 3.0 undecidable manual Pg 18.129999 0
IV.LAV9.HHZ. 2020-12-21T04:34:33.36 3.0 undecidable manual Sg 6.19 0
IV.MILN.HHZ. 2020-12-21T04:34:32.99 3.0 undecidable manual Sg 8.22 0
IV.RDP.HHZ. 2020-12-21T04:34:27.35 3.0 undecidable manual Sg 1.75 0
IV.QLNO.HHZ. 2020-12-21T04:34:26.21 3.0 undecidable manual Sg 6.53 0
IV.MNTT.EHZ. 2020-12-21T04:34:22.43 3.0 undecidable manual Sn 3.39 0
IV.FIAM.HHZ. 2020-12-21T04:34:22.72 3.0 undecidable manual Sg 1.6 0
IV.CIGN.HHZ. 2020-12-21T04:34:21.65 3.0 undecidable manual Pg 6.28 0
IV.MNTT.EHZ. 2020-12-21T04:33:53.01 3.0 positive manual Pn -1.62 0
IV.CAFI.HHZ. 2020-12-21T04:33:51.24 0.6 undecidable manual S 129 79.7646 50 -0.28 42
IV.CASP.HHZ. 2020-12-21T04:33:47.41 0.1 undecidable manual P 194 112.998 50 1.03 60
IV.FROS.CHZ. 2020-12-21T04:33:46.74 0.3 undecidable manual S 183 63.3921 50 -0.41 63
IV.PII.HHZ. 2020-12-21T04:33:44.18 0.1 undecidable manual S 263 54.0015 50 -0.46 84
IV.SFI.EHZ. 2020-12-21T04:33:44.61 0.6 undecidable manual S 75 54.0015 50 -0.04 46
IV.BADI.EHZ. 2020-12-21T04:33:43.53 0.3 undecidable manual P 109 89.5437 50 0.76 53
IV.CPGN.EHZ. 2020-12-21T04:33:43.62 0.3 undecidable manual P 88 90.243 50 0.74 53
GU.POPM.HHZ. 2020-12-21T04:33:42.09 1.0 undecidable manual S 310 45.621 50 -0.31 22
IV.PARC.HHZ. 2020-12-21T04:33:42.44 0.3 undecidable manual P 100 85.0482 50 0.36 61
IV.CAFI.HHZ. 2020-12-21T04:33:41.65 0.3 undecidable manual P 129 79.7646 50 0.38 61
IV.FNVD.HHZ. 2020-12-21T04:33:41.75 1.0 undecidable manual S 353 43.3233 50 -0.04 23
IV.RINC.HHZ. 2020-12-21T04:33:39.28 0.1 undecidable manual S 70 35.1426 50 -0.31 90
IV.BRIS.HHZ. 2020-12-21T04:33:39.99 0.6 undecidable manual P 43 67.1772 50 0.66 38
IV.CSNT.HHZ. 2020-12-21T04:33:39.13 0.6 undecidable manual S 167 34.9428 50 -0.43 44
IV.FROS.CHZ. 2020-12-21T04:33:39.05 0.1 undecidable manual P 183 63.3921 50 0.31 86
IV.RONT.HHZ. 2020-12-21T04:33:38.53 0.6 undecidable manual S 39 30.3474 106 0.29 46
IV.CRE.HHZ. 2020-12-21T04:33:38.74 0.1 undecidable manual P 106 63.3921 50 0 91
IV.SEI.HHZ. 2020-12-21T04:33:38.86 0.3 undecidable manual S 23 33.0447 50 -0.2 69
IV.PII.HHZ. 2020-12-21T04:33:37.13 0.1 undecidable manual P 263 54.0015 50 -0.16 90
IV.SFI.EHZ. 2020-12-21T04:33:37.33 0.3 undecidable manual P 75 54.0015 50 0.03 69
IV.RUFI.EHE. 2020-12-21T04:33:36.32 0.1 undecidable manual S 76 26.0517 109 -0.49 88
IV.ASQU.HHZ. 2020-12-21T04:33:36.18 0.1 undecidable manual P 88 47.7189 50 -0.15 91
GU.POPM.HHZ. 2020-12-21T04:33:36.33 0.3 undecidable manual P 310 45.621 50 0.33 66
IV.MOCL.EHZ. 2020-12-21T04:33:36.47 0.3 undecidable manual S 358 24.8529 109 0.04 73
IV.FNVD.HHZ. 2020-12-21T04:33:35.77 0.6 undecidable manual P 353 43.3233 50 0.12 46
IV.MPPT.EHZ. 2020-12-21T04:33:35.34 0.3 undecidable manual S 337 21.2676 112 0.08 73
IV.SEI.HHZ. 2020-12-21T04:33:34.01 0.3 undecidable manual P 23 33.0447 50 -0.06 71
IV.RINC.HHZ. 2020-12-21T04:33:34.30 0.1 undecidable manual P 70 35.1426 50 -0.08 95
IV.CSNT.HHZ. 2020-12-21T04:33:33.79 0.3 undecidable manual P 167 34.9428 50 -0.58 63
IV.RONT.HHZ. 2020-12-21T04:33:33.96 0.3 undecidable manual P 39 30.3474 106 0.36 67
IV.RUFI.EHE. 2020-12-21T04:33:32.69 0.1 undecidable manual P 76 26.0517 109 -0.09 96
IV.MOCL.EHZ. 2020-12-21T04:33:32.32 0.1 undecidable manual P 358 24.8529 109 -0.23 93
IV.CRMI.HHZ. 2020-12-21T04:33:31.26 1.0 undecidable manual P 276 17.2716 117 0.12 24
IT.FIE.HGZ. 2020-12-21T04:33:31.39 0.3 undecidable manual S 70 8.5803 136 -0.14 73
IV.MPPT.EHZ. 2020-12-21T04:33:31.76 0.1 undecidable manual P 337 21.2676 112 -0.12 96
IV.FIR.HHZ. 2020-12-21T04:33:30.59 0.3 undecidable manual S 98 4.995 151 -0.18 73
IV.FIR.HHZ. 2020-12-21T04:33:29.35 0.1 undecidable manual P 98 4.995 151 0.06 100
IT.FIE.HGZ. 2020-12-21T04:33:29.81 0.1 undecidable manual P 70 8.5803 136 0.08 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FIR.HNN. ML:2.7 0.0096443595 0.1088 AML other m 2020-12-21T04:33:30.70
IV.FIR.HHN. ML:2.7 0.009842638 0.1024 AML other m 2020-12-21T04:33:30.70
IV.FIR.HNE. ML:2.9 0.015660366 0.1696 AML other m 2020-12-21T04:33:30.67
IV.FIR.HHE. ML:2.9 0.0159246295 0.16 AML other m 2020-12-21T04:33:30.68
IV.CRMI.HHN. ML:1.2 0.00012538605 0.32 AML other m 2020-12-21T04:33:35.35
IV.CRMI.HNN. ML:1.4 0.00024832799999999997 0.1984 AML other m 2020-12-21T04:33:35.25
IV.MPPT.EHN. ML:2.1 0.00089787225 0.4 AML other m 2020-12-21T04:33:35.84
IV.MPPT.EHE. ML:2.0 0.0008340031999999999 0.5184 AML other m 2020-12-21T04:33:35.66
IV.MOCL.EHE. ML:2.2 0.001021947 0.2208 AML other m 2020-12-21T04:33:37.38
IV.MOCL.EHN. ML:2.1 0.0007075865999999999 0.2624 AML other m 2020-12-21T04:33:37.68
IV.CRMI.HNE. ML:1.6 0.00030829695 0.3808 AML other m 2020-12-21T04:33:39.52
IV.CRMI.HHE. ML:1.2 0.00013052245 0.3808 AML other m 2020-12-21T04:33:39.52
IV.RONT.HHN. ML:3.3 0.0092428745 0.1408 AML other m 2020-12-21T04:33:40.20
IV.SEI.HHN. ML:2.8 0.0027431985000000002 0.4 AML other m 2020-12-21T04:33:40.35
IV.RONT.HHE. ML:3.1 0.006617761 0.16 AML other m 2020-12-21T04:33:40.36
IV.CSNT.HHE. ML:2.0 0.00039255005 0.2816 AML other m 2020-12-21T04:33:40.58
IV.CSNT.HHN. ML:1.9 0.00030753655000000004 0.1792 AML other m 2020-12-21T04:33:40.75
IV.RINC.HHE. ML:2.6 0.0014826545 0.1792 AML other m 2020-12-21T04:33:40.79
IV.FROS.CHN. ML:1.8 0.00013660620000000001 0.224 AML other m 2020-12-21T04:33:41.28
IV.SEI.HHE. ML:2.7 0.0023132815 0.2784 AML other m 2020-12-21T04:33:41.18
IV.RINC.HHN. ML:2.3 0.0007530110500000001 0.4224 AML other m 2020-12-21T04:33:41.62
IV.ASQU.HHE. ML:1.8 0.00018691600000000002 0.3008 AML other m 2020-12-21T04:33:43.53
IV.ASQU.HHN. ML:1.8 0.00019729795 1.8208 AML other m 2020-12-21T04:33:43.96
IV.SFI.HNE. ML:1.9 0.00020316675 0.2688 AML other m 2020-12-21T04:33:45.12
IV.SFI.EHE. ML:1.9 0.0001841797 0.2592 AML other m 2020-12-21T04:33:45.13
IV.PII.HHN. ML:2.3 0.0004896729999999999 0.2784 AML other m 2020-12-21T04:33:45.84
IV.PII.HHE. ML:2.0 0.00025678604999999997 0.2592 AML other m 2020-12-21T04:33:45.72
GU.POPM.HHE. ML:1.6 0.0001159148 1.6608 AML other m 2020-12-21T04:33:45.16
IV.SFI.EHN. ML:1.9 0.00016931025 0.24 AML other m 2020-12-21T04:33:46.33
GU.POPM.HHN. ML:1.7 0.00014317825 0.3008 AML other m 2020-12-21T04:33:46.38
IV.FNVD.HHN. ML:2.0 0.0003495369 0.5792 AML other m 2020-12-21T04:33:46.76
IV.FNVD.HHE. ML:1.8 0.0001930683 0.7968 AML other m 2020-12-21T04:33:46.52
IV.SFI.HNN. ML:2.0 0.0002426777 0.6304 AML other m 2020-12-21T04:33:47.20
IV.FROS.CHE. ML:2.0 0.000176801 0.256 AML other m 2020-12-21T04:33:48.08
IV.CRE.HHE. ML:2.0 0.00019594785000000002 0.4192 AML other m 2020-12-21T04:33:48.12
IV.RIBO.EHE.01 ML:1.6 0.000038611235 0.24 AML other m 2020-12-21T04:33:48.74
IV.BRIS.HHE. ML:1.9 0.00015387185 0.32 AML other m 2020-12-21T04:33:52.31
IV.CRE.HHN. ML:2.0 0.00020050200000000003 1.5392 AML other m 2020-12-21T04:33:53.04
IV.BADI.EHN. ML:1.9 0.000088714055 1.76 AML other m 2020-12-21T04:33:57.10
IV.BRIS.HHN. ML:1.9 0.00015085959999999997 0.4992 AML other m 2020-12-21T04:33:57.37
IV.PARC.HHN. ML:2.1 0.0001663005 1.5584 AML other m 2020-12-21T04:33:57.21
IV.PARC.HHE. ML:1.7 0.00007187025999999999 0.3424 AML other m 2020-12-21T04:33:57.23
IV.BADI.EHE. ML:1.7 0.00005641668 0.4608 AML other m 2020-12-21T04:34:00.90
IV.CASP.HHN. ML:1.4 0.000019000444999999998 0.5408 AML other m 2020-12-21T04:34:03.71
IV.CPGN.EHE. ML:1.8 0.000078639415 1.52 AML other m 2020-12-21T04:34:04.08
IV.CASP.HHE. ML:1.4 0.000020806745 0.8224 AML other m 2020-12-21T04:34:08.04
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
Waveforms Seismic signals in miniseed + resp format Download