Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 19-02-2021 and time 08:50:58 (Italy) in region 2 km NE Castelfiorentino (FI)

A magnitude ML 1.2 earthquake occured in region: 2 km NE Castelfiorentino (FI), on

  • 19-02-2021 07:50:58 (UTC)
  • 19-02-2021 08:50:58 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.62, 10.98 at 6 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Castelfiorentino FI 2 17504 17504
Montespertoli FI 8 13537 31041
Certaldo FI 10 16121 47162
Gambassi Terme FI 10 4870 52032
Montaione FI 10 3700 55732
Empoli FI 11 48109 103841
San Miniato PI 12 27934 131775
Montelupo Fiorentino FI 12 14098 145873
Capraia e Limite FI 13 7670 153543
San Casciano in Val di Pesa FI 17 17062 170605
Palaia PI 17 4612 175217
Tavarnelle Val di Pesa FI 17 7800 183017
Cerreto Guidi FI 17 10870 193887
Barberino Val d'Elsa FI 18 4386 198273
Fucecchio FI 18 23618 221891
San Gimignano SI 18 7820 229711
Montopoli in Val d'Arno PI 18 11148 240859
Vinci FI 19 14604 255463
Santa Croce sull'Arno PI 19 14601 270064
Lastra a Signa FI 19 20156 290220
Signa FI 20 19179 309399

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km SW of Scandicci (50609 inhabitants)
27 Km SW of Firenze (382808 inhabitants)
30 Km SW of Prato (191150 inhabitants)
35 Km S of Pistoia (90315 inhabitants)
44 Km NW of Siena (53903 inhabitants)
46 Km SE of Lucca (89046 inhabitants)
48 Km E of Pisa (89158 inhabitants)
55 Km E of Livorno (159219 inhabitants)
65 Km E of Viareggio (62467 inhabitants)
75 Km W of Arezzo (99543 inhabitants)
82 Km SE of Massa (69479 inhabitants)
87 Km SE of Carrara (63133 inhabitants)
97 Km N of Grosseto (82087 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.2 2021-02-19
07:50:58		 43.62 10.98 6 2021-02-19
08:02:07		 Sala Sismica INGV-Roma 87293871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-19 07:50:58 ± 0.13
Latitude 43.62 ± 0.01
Longitude 10.98 ± 0.01
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87293871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 624
Semi-minor axis of confidence ellipse (meter) 210
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 250
Circular confidence region, given by single value of horizontal uncertainty (meter) 620
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 73
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.70147
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 17
Type of magnitude ML
Reference to an origin 87293871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-19 08:02:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ENIC.HNZ. 2021-02-19T07:52:36.15 3.0 undecidable manual Pn -3.04 0
CH.BERNI.HHZ. 2021-02-19T07:52:27.72 3.0 undecidable manual Sg 6.46 0
IT.SULP.HGZ. 2021-02-19T07:52:24.62 3.0 undecidable manual Sg 6.51 0
IV.MONC.HHZ. 2021-02-19T07:52:16.61 3.0 undecidable manual Sn 1.37 0
IV.SENI.HNZ. 2021-02-19T07:51:55.38 3.0 undecidable manual Sg 2.6 0
IT.GLNS.HNZ. 2021-02-19T07:51:52.46 3.0 negative manual Pn -0.53 0
IV.MELA.HHZ. 2021-02-19T07:51:52.42 3.0 positive manual Pn -3.91 0
MN.TRI.HHZ. 2021-02-19T07:51:44.56 3.0 positive manual Pn -1.07 0
IV.MF5.EHZ. 2021-02-19T07:51:38.40 3.0 positive manual Pg 5.35 0
IV.CAMP.HHZ. 2021-02-19T07:51:33.90 3.0 undecidable manual Pn -1.5 0
IV.TRIF.CHE. 2021-02-19T07:51:16.81 0.6 undecidable manual S 186 0.5126 50 -0.05 50
IV.RINC.HHE. 2021-02-19T07:51:16.32 0.6 undecidable manual S 60 0.5216 50 -0.8 40
GU.MAIM.HHE. 2021-02-19T07:51:14.32 0.6 undecidable manual S 309 0.456 50 -0.87 40
IV.MAGO.CHZ. 2021-02-19T07:51:13.72 0.6 undecidable manual S 214 0.4227 50 -0.47 47
IV.LMD.HHZ. 2021-02-19T07:51:12.37 1.0 undecidable manual P 49 0.6916 50 0.4 22
IV.CRE.HHZ. 2021-02-19T07:51:12.59 0.6 positive manual P 90 0.7015 50 0.44 44
IV.MPPT.EHZ. 2021-02-19T07:51:11.02 0.6 undecidable manual S 13 0.3417 99 -0.37 49
IV.PII.HHZ. 2021-02-19T07:51:10.93 0.6 undecidable manual S 287 0.3444 99 -0.56 46
IV.RINC.HHE. 2021-02-19T07:51:09.27 0.6 undecidable manual P 60 0.5216 50 0.2 49
IV.RONT.HHZ. 2021-02-19T07:51:09.09 0.3 undecidable manual P 41 0.4919 50 0.53 68
IV.SEI.HHZ. 2021-02-19T07:51:09.04 0.6 undecidable manual P 32 0.5081 50 0.2 49
IV.BDI.HHZ. 2021-02-19T07:51:09.31 0.6 negative manual P 328 0.5189 50 0.29 48
IV.TRIF.CHE. 2021-02-19T07:51:09.02 0.3 undecidable manual P 186 0.5126 50 0.1 74
GU.MAIM.HHE. 2021-02-19T07:51:08.19 0.1 undecidable manual P 309 0.456 50 0.24 98
IV.CSNT.HHZ. 2021-02-19T07:51:08.19 0.6 undecidable manual S 124 0.2698 101 -0.48 48
IV.MAGO.CHZ. 2021-02-19T07:51:07.53 0.1 undecidable manual P 214 0.4227 50 0.15 100
IV.PII.HHZ. 2021-02-19T07:51:06.16 0.1 negative manual P 287 0.3444 99 0.34 98
IV.MOCL.EHZ. 2021-02-19T07:51:06.87 0.6 negative manual P 21 0.4056 50 -0.22 49
IV.MPPT.EHZ. 2021-02-19T07:51:05.71 0.6 undecidable manual P 13 0.3417 99 -0.05 52
IV.CSNT.HHZ. 2021-02-19T07:51:04.11 0.3 undecidable manual P 124 0.2698 101 -0.08 78
IT.FIE.HGZ. 2021-02-19T07:51:02.03 3.0 undecidable manual P -3.13 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PII.HHN. ML:1.4 0.0001008065 0.3392 AML other m 2021-02-19T07:51:10.00
IV.PII.HHE. ML:1.4 9.5037795E-5 0.16 AML other m 2021-02-19T07:51:11.08
IV.CSNT.HHE. ML:1 5.050182E-5 0.16 AML other m 2021-02-19T07:51:08.85
IV.CSNT.HHN. ML:1.2 7.2526185E-5 0.3008 AML other m 2021-02-19T07:51:08.79
IV.MOCL.EHE. ML:1.2 4.55E-5 0.38 AML other m 2021-02-19T07:51:16.65
IV.RONT.HHN. ML:1.9 0.000183 1.82 AML other m 2021-02-19T07:51:18.97
IV.RONT.HHE. ML:1.9 0.0001845 0.28 AML other m 2021-02-19T07:51:19.50
IV.SEI.HHE. ML:1.2 4.165E-5 0.46 AML other m 2021-02-19T07:51:19.20
IV.SEI.HHN. ML:1.5 6.78E-5 0.34 AML other m 2021-02-19T07:51:20.39
IV.MPPT.EHE. ML:0.9 2.882929E-5 0.16 AML other m 2021-02-19T07:51:12.43
IV.MPPT.EHN. ML:1.1 4.673706E-5 0.2432 AML other m 2021-02-19T07:51:11.57
IV.BDI.HHE. ML:1.3 3.871506E-5 0.3392 AML other m 2021-02-19T07:51:21.96
IV.BDI.HHN. ML:1.1 2.7088475E-5 0.1408 AML other m 2021-02-19T07:51:19.94
IV.LMD.HHE. ML:1.1 1.880329E-5 0.4224 AML other m 2021-02-19T07:51:24.95
IV.LMD.HHN. ML:1 1.387192765E-5 0.1664 AML other m 2021-02-19T07:51:22.69
IV.CRE.HHE. ML:1 1.578839E-5 0.3584 AML other m 2021-02-19T07:51:24.59
IV.CRE.HHN. ML:1 1.36368255E-5 0.3584 AML other m 2021-02-19T07:51:22.73
IV.MF5.EHE. ML:2.2 4.439952E-5 0.1984 AML other m 2021-02-19T07:52:23.90
IV.MF5.EHN. ML:2 2.7346335E-5 0.2368 AML other m 2021-02-19T07:52:24.35
MN.TRI.HHE. ML:2.2 1.29643195E-5 0.2048 AML other m 2021-02-19T07:52:05.72
MN.TRI.HHN. ML:1.7 6.0730895E-6 0.096 AML other m 2021-02-19T07:52:04.58
IV.MELA.HNE. ML:3.5 0.00017323245 0.8704 AML other m 2021-02-19T07:53:02.00
IV.MELA.HNN. ML:3.5 0.0001964654 1.0176 AML other m 2021-02-19T07:52:42.12
IV.MELA.HHE. ML:2.9 4.8981005E-5 0.8 AML other m 2021-02-19T07:52:35.98
IV.MELA.HHN. ML:2.8 4.0956065E-5 0.0768 AML other m 2021-02-19T07:51:52.53
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