Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.5 on date 20-04-2016 and time 01:04:21 (Italy) in region 6 km W Greve in Chianti (FI)

A magnitude ML 1.5 earthquake occured in region: 6 km W Greve in Chianti (FI), on

  • 19-04-2016 23:04:21 (UTC)
  • 20-04-2016 01:04:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.5950, 11.2440 at 10 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
Greve in Chianti FI 6 13862 13862
Tavarnelle Val di Pesa FI 7 7800 21662
Barberino Val d'Elsa FI 8 4386 26048
San Casciano in Val di Pesa FI 8 17062 43110
Impruneta FI 10 14615 57725
Castellina in Chianti SI 14 2859 60584
Montespertoli FI 15 13537 74121
Radda in Chianti SI 16 1613 75734
Poggibonsi SI 16 29196 104930
Certaldo FI 17 16121 121051
Figline e Incisa Valdarno FI 18 23505 144556
Bagno a Ripoli FI 19 25611 170167
Scandicci FI 19 50609 220776
Firenze FI 20 382808 603584

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km S of Scandicci (50609 inhabitants)
20 Km S of Firenze (382808 inhabitants)
32 Km N of Siena (53903 inhabitants)
34 Km SE of Prato (191150 inhabitants)
46 Km SE of Pistoia (90315 inhabitants)
53 Km W of Arezzo (99543 inhabitants)
66 Km E of Lucca (89046 inhabitants)
69 Km E of Pisa (89158 inhabitants)
75 Km E of Livorno (159219 inhabitants)
85 Km E of Viareggio (62467 inhabitants)
92 Km SW of Faenza (58541 inhabitants)
92 Km SW of Imola (69797 inhabitants)
93 Km N of Grosseto (82087 inhabitants)
95 Km SW of Forlì (117913 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 1.5 2016-04-19
23:04:21		 43.5953 11.2442 10 2016-05-17
13:18:33		 Bollettino Sismico Italiano INGV 24859901
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2016-04-19 23:04:21 ± 0.12
Latitude 43.5953 ± 0.0081
Longitude 11.2442 ± 0.0087
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 24859901

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 825
Semi-minor axis of confidence ellipse (meter) 670
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 179
Circular confidence region, given by single value of horizontal uncertainty (meter) 820.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.53510
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.4
Num. used stations 4
Type of magnitude ML
Reference to an origin 24859901
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2016-05-05 13:05:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CESI.HHZ. 2016-04-19T23:04:48.56 3.0 undecidable manual P 0.22 0
IV.CRE.HHE. 2016-04-19T23:04:40.12 0.1 undecidable manual S 87 56.8986 50 0.23 88
IV.PII.HHZ. 2016-04-19T23:04:40.10 0.3 undecidable manual S 284 59.3961 50 -0.46 62
IV.ASQU.HHE. 2016-04-19T23:04:37.60 0.1 undecidable manual S 63 49.1175 50 -0.2 90
IV.FROS.HHZ. 2016-04-19T23:04:35.88 0.3 undecidable manual S 189 43.3233 50 -0.39 65
IV.RUFI.EHZ. 2016-04-19T23:04:33.28 0.1 undecidable manual S 38 34.3434 50 -0.57 84
IV.PII.HHZ. 2016-04-19T23:04:32.93 0.1 undecidable manual P 284 59.3961 50 0.26 87
IV.CRE.HHE. 2016-04-19T23:04:32.80 0.1 undecidable manual P 87 56.8986 50 0.52 82
IV.CRMI.HNN. 2016-04-19T23:04:32.79 0.1 undecidable manual S 316 30.747 50 -0.11 94
IV.ASQU.HHE. 2016-04-19T23:04:31.35 0.1 undecidable manual P 63 49.1175 50 0.27 88
IV.FROS.HHZ. 2016-04-19T23:04:30.61 0.1 undecidable manual P 189 43.3233 50 0.41 87
IV.RUFI.EHZ. 2016-04-19T23:04:28.58 0.1 undecidable manual P 38 34.3434 50 -0.22 92
IV.CRMI.HNN. 2016-04-19T23:04:28.70 0.1 undecidable manual P 316 30.747 50 0.46 88
IV.CSNT.HHZ. 2016-04-19T23:04:27.38 0.1 undecidable manual S 165 14.0748 124 -0.39 92
IV.OSSC.HHZ. 2016-04-19T23:04:26.17 0.1 undecidable manual S 179 7.9809 140 -0.02 100
IV.CSNT.HHZ. 2016-04-19T23:04:25.23 0.1 undecidable manual P 165 14.0748 124 -0.06 98
IV.OSSC.HHZ. 2016-04-19T23:04:24.51 0.1 undecidable manual P 179 7.9809 140 0.13 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHN. ML:1.4 0.000255 0.56 AML other m 2016-04-19T23:04:27.96
IV.CSNT.HHE. ML:1.3 0.0002035 1.36 AML other m 2016-04-19T23:04:27.98
IV.FROS.HHE. ML:1.4 0.00007549999999999999 0.7 AML other m 2016-04-19T23:04:38.48
IV.FROS.HHN. ML:1.5 0.000088 0.92 AML other m 2016-04-19T23:04:37.71
IV.OSSC.HNE. ML:2.1 0.001825 0.14 AML other m 2016-04-19T23:04:26.35
IV.OSSC.HHN. ML:2.1 0.0018599999999999999 0.14 AML other m 2016-04-19T23:04:26.42
IV.OSSC.HHE. ML:2.0 0.0014249999999999998 0.14 AML other m 2016-04-19T23:04:26.40
IV.OSSC.HNN. ML:2.0 0.001355 0.14 AML other m 2016-04-19T23:04:26.47
IV.PII.HHE. ML:1.2 0.00003135 1.58 AML other m 2016-04-19T23:04:40.19
IV.PII.HHN. ML:1.1 0.00002375 1.42 AML other m 2016-04-19T23:04:46.10
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