Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 06-04-2020 and time 02:57:52 (Italy) in region 4 km N Greve in Chianti (FI)

A magnitude ML 1.3 earthquake occured in region: 4 km N Greve in Chianti (FI), on

  • 06-04-2020 00:57:52 (UTC)
  • 06-04-2020 02:57:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.6210, 11.3050 at 3 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
Greve in Chianti FI 4 13862 13862
Impruneta FI 8 14615 28477
San Casciano in Val di Pesa FI 10 17062 45539
Tavarnelle Val di Pesa FI 12 7800 53339
Figline e Incisa Valdarno FI 13 23505 76844
Barberino Val d'Elsa FI 14 4386 81230
Bagno a Ripoli FI 15 25611 106841
Radda in Chianti SI 16 1613 108454
Rignano sull'Arno FI 17 8651 117105
Castellina in Chianti SI 17 2859 119964
Firenze FI 17 382808 502772
Scandicci FI 18 50609 553381
Cavriglia AR 18 9614 562995
Montespertoli FI 19 13537 576532
San Giovanni Valdarno AR 19 17018 593550
Gaiole in Chianti SI 20 2758 596308

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km S of Firenze (382808 inhabitants)
18 Km SE of Scandicci (50609 inhabitants)
33 Km SE of Prato (191150 inhabitants)
34 Km N of Siena (53903 inhabitants)
47 Km SE of Pistoia (90315 inhabitants)
50 Km W of Arezzo (99543 inhabitants)
69 Km E of Lucca (89046 inhabitants)
73 Km E of Pisa (89158 inhabitants)
81 Km E of Livorno (159219 inhabitants)
87 Km SW of Faenza (58541 inhabitants)
88 Km SW of Imola (69797 inhabitants)
89 Km E of Viareggio (62467 inhabitants)
89 Km SW of Forlì (117913 inhabitants)
95 Km SW of Cesena (96758 inhabitants)
97 Km N of Grosseto (82087 inhabitants)
97 Km S of Bologna (386663 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 1.3 2020-04-06
00:57:52		 43.6207 11.3047 3 2020-04-06
01:05:07		 Sala Sismica INGV-Roma 77937321
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-04-06 00:57:52 ± 0.09
Latitude 43.6207 ± 0.0027
Longitude 11.3047 ± 0.0099
Depth (km) 3 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 77937321

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 616
Semi-minor axis of confidence ellipse (meter) 548
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 96
Circular confidence region, given by single value of horizontal uncertainty (meter) 620.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 163
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.46765
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 77937321
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-04-06 01:05:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RONT.HHZ. 2020-04-06T00:58:07.14 0.1 undecidable manual S 14 42.624 94 0.28 100
IV.CRE.HHE. 2020-04-06T00:58:02.52 0.3 undecidable manual P 90 51.9036 93 0.06 77
IV.RUFI.EHZ. 2020-04-06T00:58:02.20 0.3 undecidable manual S 34 29.1486 96 -0.01 81
IV.RIBO.EHZ.01 2020-04-06T00:58:01.25 3.0 undecidable manual P 0.01 0
IV.RONT.HHZ. 2020-04-06T00:58:00.63 0.3 positive manual P 14 42.624 94 0.04 79
IV.ASQU.HHE. 2020-04-06T00:58:00.58 0.3 undecidable manual P 63 43.5231 94 -0.19 76
IV.CSNT.HHZ. 2020-04-06T00:57:58.02 0.3 undecidable manual S 184 16.3725 101 0.19 80
IV.FIR.HHZ. 2020-04-06T00:57:58.18 0.3 undecidable manual S 347 17.4714 100 -0.02 82
IV.RUFI.EHZ. 2020-04-06T00:57:57.77 0.6 negative manual P 34 29.1486 96 -0.14 52
IV.CSNT.HHZ. 2020-04-06T00:57:55.28 0.3 negative manual P 184 16.3725 101 -0.1 81
IV.FIR.HHZ. 2020-04-06T00:57:55.39 0.3 undecidable manual P 347 17.4714 100 -0.21 79
IV.OSSC.HHZ. 2020-04-06T00:57:54.16 3.0 undecidable manual P 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHE. ML:1.0 0.00011649999999999999 0.78 AML other m 2020-04-06T00:57:58.28
IV.CSNT.HHN. ML:1.3 0.0001985 0.48 AML other m 2020-04-06T00:57:58.49
IV.RONT.HHE. ML:1.5 0.00010550000000000002 1.46 AML other m 2020-04-06T00:58:07.96
IV.RONT.HHN. ML:1.4 0.00007975 1.16 AML other m 2020-04-06T00:58:11.96
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