Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 01-04-2020 and time 04:30:17 (Italy) in region 2 km E Castelfiorentino (FI)

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

  • 01-04-2020 02:30:17 (UTC)
  • 01-04-2020 04:30:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6150, 10.9930 at 10 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 8 16121 47162
Gambassi Terme FI 9 4870 52032
Montaione FI 9 3700 55732
Empoli FI 12 48109 103841
Montelupo Fiorentino FI 13 14098 117939
San Miniato PI 13 27934 145873
Capraia e Limite FI 14 7670 153543
Tavarnelle Val di Pesa FI 16 7800 161343
San Casciano in Val di Pesa FI 16 17062 178405
Barberino Val d'Elsa FI 17 4386 182791
San Gimignano SI 17 7820 190611
Palaia PI 18 4612 195223
Cerreto Guidi FI 19 10870 206093
Fucecchio FI 19 23618 229711
Montopoli in Val d'Arno PI 20 11148 240859
Lastra a Signa FI 20 20156 261015
Vinci FI 20 14604 275619

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km SW of Scandicci (50609 inhabitants)
27 Km SW of Firenze (382808 inhabitants)
31 Km S of Prato (191150 inhabitants)
36 Km S of Pistoia (90315 inhabitants)
43 Km NW of Siena (53903 inhabitants)
47 Km SE of Lucca (89046 inhabitants)
49 Km E of Pisa (89158 inhabitants)
55 Km E of Livorno (159219 inhabitants)
66 Km E of Viareggio (62467 inhabitants)
74 Km W of Arezzo (99543 inhabitants)
83 Km SE of Massa (69479 inhabitants)
88 Km SE of Carrara (63133 inhabitants)
95 Km N of Grosseto (82087 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
Reviewed
Rev100 		ML 1.4 2020-04-01
02:30:17		 43.6147 10.9928 10 2020-04-01
02:39:14		 Sala Sismica INGV-Roma 77743481
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-04-01 02:30:17 ± 0.26
Latitude 43.6147 ± 0.0090
Longitude 10.9928 ± 0.0149
Depth (km) 10 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 77743481

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1152
Semi-minor axis of confidence ellipse (meter) 772
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 79
Circular confidence region, given by single value of horizontal uncertainty (meter) 1150.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 100
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.49
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.53150
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 77743481
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-04-01 02:39:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MCRV.HHZ. 2020-04-01T02:31:57.47 3.0 undecidable manual Sn -9.32 0
IV.VITU.HHZ. 2020-04-01T02:31:50.05 3.0 undecidable manual Sn -2.78 0
IV.BRMO.HHZ. 2020-04-01T02:31:45.81 3.0 undecidable manual Sg 10.74 0
IV.VCEL.EHZ. 2020-04-01T02:31:25.22 3.0 undecidable manual Sg 2.81 0
IV.VVLD.HHZ. 2020-04-01T02:31:25.20 3.0 undecidable manual Sn -2.77 0
IV.MCRV.HHZ. 2020-04-01T02:31:14.01 3.0 undecidable manual Pn -4.38 0
IV.MNTT.EHZ. 2020-04-01T02:31:04.48 3.0 undecidable manual Sn -6.17 0
IV.VCEL.EHZ. 2020-04-01T02:30:57.80 3.0 undecidable manual Pg 4.34 0
IV.SNTG.HHZ. 2020-04-01T02:30:36.91 3.0 undecidable manual Pn -2.85 0
IV.TRIF.CHE. 2020-04-01T02:30:35.22 0.1 undecidable manual S 188 55.8996 50 0.15 97
IV.RONT.HHZ. 2020-04-01T02:30:35.80 0.1 undecidable manual S 40 54.8007 50 1.02 73
IV.RUFI.EHZ. 2020-04-01T02:30:32.30 0.1 undecidable manual S 59 48.2184 50 -0.72 84
IV.FROS.CHZ. 2020-04-01T02:30:32.33 0.1 undecidable manual S 164 46.8198 50 -0.3 96
IV.PII.HHZ. 2020-04-01T02:30:29.92 0.1 undecidable manual S 288 39.4272 50 -0.74 85
IV.BDI.HHZ. 2020-04-01T02:30:28.62 0.3 positive manual P 328 58.9965 50 0.55 66
IV.TRIF.CHE. 2020-04-01T02:30:28.00 0.1 undecidable manual P 188 55.8996 50 0.41 92
IV.RONT.HHZ. 2020-04-01T02:30:28.30 0.1 undecidable manual P 40 54.8007 50 0.88 77
GU.POPM.HHZ. 2020-04-01T02:30:27.31 1.0 positive manual P 339 51.3153 50 0.43 23
IV.CSNT.HHZ. 2020-04-01T02:30:27.18 0.1 undecidable manual S 123 28.5492 50 -0.59 91
IV.FROS.CHZ. 2020-04-01T02:30:26.60 0.1 positive manual P 164 46.8198 50 0.42 93
IV.FIR.HHZ. 2020-04-01T02:30:26.87 3.0 undecidable manual P 0
IV.RUFI.EHZ. 2020-04-01T02:30:26.21 0.1 undecidable manual P 59 48.2184 50 -0.2 97
IV.PII.HHZ. 2020-04-01T02:30:25.25 1.0 undecidable manual P 288 39.4272 50 0.21 25
IV.MPPT.EHE. 2020-04-01T02:30:24.80 0.1 undecidable manual P 12 38.8278 50 -0.16 100
IV.CRMI.HHZ. 2020-04-01T02:30:24.67 0.1 undecidable manual S 357 20.0688 116 -0.45 97
IV.CSNT.HHZ. 2020-04-01T02:30:23.27 0.6 negative manual P 123 28.5492 50 -0.11 51
IV.CRMI.HHZ. 2020-04-01T02:30:21.91 0.3 positive manual P 357 20.0688 116 0.07 79
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHE. ML:1.2 0.00007539999999999999 1.62 AML other m 2020-04-01T02:30:28.01
IV.CSNT.HHN. ML:1.4 0.00011449999999999999 1.46 AML other m 2020-04-01T02:30:28.24
IV.FROS.CHE. ML:1.6 0.0001103 0.82 AML other m 2020-04-01T02:30:32.97
IV.FROS.CHN. ML:1.6 0.0001125 0.42 AML other m 2020-04-01T02:30:33.77
GU.POPM.HHE. ML:1.3 0.0000574 0.82 AML other m 2020-04-01T02:30:35.69
GU.POPM.HHN. ML:1.5 0.0000773 0.52 AML other m 2020-04-01T02:30:35.76
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