Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 16-10-2020 and time 01:25:01 (Italy) in region 3 km SW Poggibonsi (SI)

A magnitude ML 1.8 earthquake occured in region: 3 km SW Poggibonsi (SI), on

  • 15-10-2020 23:25:01 (UTC)
  • 16-10-2020 01:25:01 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4520, 11.1120 at 7 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
Poggibonsi SI 3 29196 29196
Colle di Val d'Elsa SI 3 21620 50816
San Gimignano SI 6 7820 58636
Monteriggioni SI 11 9810 68446
Barberino Val d'Elsa FI 11 4386 72832
Certaldo FI 12 16121 88953
Tavarnelle Val di Pesa FI 13 7800 96753
Casole d'Elsa SI 14 3897 100650
Castellina in Chianti SI 14 2859 103509
Gambassi Terme FI 16 4870 108379
Montaione FI 20 3700 112079

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km NW of Siena (53903 inhabitants)
35 Km S of Scandicci (50609 inhabitants)
37 Km SW of Firenze (382808 inhabitants)
48 Km S of Prato (191150 inhabitants)
56 Km S of Pistoia (90315 inhabitants)
62 Km W of Arezzo (99543 inhabitants)
64 Km E of Pisa (89158 inhabitants)
66 Km E of Livorno (159219 inhabitants)
66 Km SE of Lucca (89046 inhabitants)
77 Km N of Grosseto (82087 inhabitants)
83 Km SE of Viareggio (62467 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 1.8 2020-10-15
23:25:01		 43.4522 11.1122 7 2021-02-26
14:56:06		 Bollettino Sismico Italiano INGV 84776251
Reviewed
Rev100 		ML 1.9 2020-10-15
23:25:01		 43.453 11.1212 8 2020-10-15
23:45:33		 Sala Sismica INGV-Roma 83812001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-15 23:25:01 ± 0.12
Latitude 43.4522 ± 0.0045
Longitude 11.1122 ± 0.0099
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 84776251

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 689
Semi-minor axis of confidence ellipse (meter) 396
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 106
Circular confidence region, given by single value of horizontal uncertainty (meter) 690.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 72
Number of associated phases, regardless of their use for origin computation 39
Number of defining phases 35
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.74824
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 20
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 37
Type of magnitude ML
Reference to an origin 84776251
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-12-28 16:13:09

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 22
Type of magnitude ML
Reference to an origin 83812001
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-15 23:45:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PTRJ.HNZ. 2020-10-15T23:26:34.43 3.0 undecidable manual Sn 0.54 0
ST.GAGG.HHZ. 2020-10-15T23:26:24.71 3.0 undecidable manual Sg 7.13 0
IV.MCRV.HHZ. 2020-10-15T23:26:12.39 3.0 negative manual Pg 8.67 0
ST.GAGG.HHZ. 2020-10-15T23:25:48.86 3.0 undecidable manual Pg 4.57 0
TV.SF01.EHZ. 2020-10-15T23:25:25.31 0.6 undecidable manual S 153 79.8645 50 -0.91 37
GU.POPM.HHZ. 2020-10-15T23:25:24.10 0.3 undecidable manual S 337 71.6727 50 0.07 72
IV.RONT.HHZ. 2020-10-15T23:25:23.07 0.6 undecidable manual S 23 65.2902 50 0.73 41
IV.SEI.HHZ. 2020-10-15T23:25:23.60 0.6 undecidable manual S 16 69.6747 50 0.11 48
GU.MAIM.HHE. 2020-10-15T23:25:23.43 0.6 undecidable manual S 316 71.4729 50 -0.55 43
IV.RIBO.EHZ.01 2020-10-15T23:25:19.69 0.6 undecidable manual S 185 56.0994 50 -0.18 48
IV.MPPT.EHZ. 2020-10-15T23:25:19.50 0.6 undecidable manual S 358 56.0994 50 -0.38 47
IV.PII.HHZ. 2020-10-15T23:25:19.20 0.6 undecidable manual S 303 55.8996 50 -0.61 43
IV.RUFI.EHZ. 2020-10-15T23:25:18.68 0.6 undecidable manual S 37 53.4021 50 -0.47 46
IV.SSP9.EHZ. 2020-10-15T23:25:17.05 0.1 undecidable manual P 80 83.0502 50 0.72 79
IV.BDI.HHZ. 2020-10-15T23:25:16.20 0.3 undecidable manual P 329 79.365 50 0.45 66
TV.SF01.EHZ. 2020-10-15T23:25:16.12 0.3 undecidable manual P 153 79.8645 50 0.29 68
IV.MAGO.CHZ. 2020-10-15T23:25:15.80 0.6 undecidable manual S 242 41.625 50 -0.23 49
IV.SFI.EHZ. 2020-10-15T23:25:15.75 0.3 undecidable manual P 49 77.4669 50 0.29 68
GU.POPM.HHZ. 2020-10-15T23:25:15.65 0.6 undecidable manual P 337 71.6727 50 1.08 34
IV.TRIF.CHZ. 2020-10-15T23:25:15.46 0.3 undecidable manual S 204 41.0256 50 -0.41 71
IV.RONT.HHZ. 2020-10-15T23:25:14.18 0.3 undecidable manual P 23 65.2902 50 0.59 64
IV.CRMI.HHZ. 2020-10-15T23:25:14.95 0.3 undecidable manual S 344 39.5271 50 -0.51 70
IV.SEI.HHZ. 2020-10-15T23:25:14.45 0.6 undecidable manual P 16 69.6747 50 0.2 47
GU.MAIM.HHE. 2020-10-15T23:25:14.70 0.3 undecidable manual P 316 71.4729 50 0.17 71
IV.MOCL.EHZ. 2020-10-15T23:25:13.28 0.6 undecidable manual P 5 61.5939 50 0.27 47
IV.MPPT.EHZ. 2020-10-15T23:25:12.08 0.3 undecidable manual P 358 56.0994 50 -0.09 74
IV.PII.HHZ. 2020-10-15T23:25:12.23 0.1 negative manual P 303 55.8996 50 0.09 99
IV.RIBO.EHZ.01 2020-10-15T23:25:12.83 0.3 undecidable manual P 185 56.0994 50 0.67 64
IV.RINC.HHZ. 2020-10-15T23:25:12.98 0.3 undecidable manual P 39 62.3931 50 -0.17 72
IV.FROS.CHZ. 2020-10-15T23:25:11.31 0.3 undecidable manual S 172 27.1506 105 -0.08 78
IV.RUFI.EHZ. 2020-10-15T23:25:11.38 0.1 positive manual P 37 53.4021 50 -0.37 94
IV.CRMI.HHZ. 2020-10-15T23:25:09.48 0.3 undecidable manual P 344 39.5271 50 -0.14 76
IV.TRIF.CHZ. 2020-10-15T23:25:09.79 0.3 undecidable manual P 204 41.0256 50 -0.06 77
IV.MAGO.CHZ. 2020-10-15T23:25:09.92 0.6 undecidable manual P 242 41.625 50 -0.02 51
IV.FROS.CHZ. 2020-10-15T23:25:07.55 0.1 positive manual P 172 27.1506 105 0.28 100
IV.CSNT.HHZ. 2020-10-15T23:25:06.66 0.3 undecidable manual S 81 14.4744 117 -0.63 69
IV.OSSC.HNZ. 2020-10-15T23:25:06.64 0.6 undecidable manual S 54 13.3755 119 -0.29 51
IV.CSNT.HHZ. 2020-10-15T23:25:04.75 0.3 undecidable manual P 81 14.4744 117 -0.15 79
IV.OSSC.HNZ. 2020-10-15T23:25:04.71 0.3 undecidable manual P 54 13.3755 119 0.02 81
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CSNT.HHN. ML:2.0 0.0009988638 0.2432 AML other m 2020-10-15T23:25:07.04
IV.CSNT.HHE. ML:1.8 0.0006456592 0.2176 AML other m 2020-10-15T23:25:07.47
IV.FROS.CHE. ML:2.2 0.000962221 0.2304 AML other m 2020-10-15T23:25:11.43
IV.FROS.CHN. ML:2.1 0.00065463295 0.192 AML other m 2020-10-15T23:25:12.08
IV.CRMI.HHN. ML:1.3 0.00007160297 0.2176 AML other m 2020-10-15T23:25:15.42
IV.CRMI.HNN. ML:1.8 0.0002126046 0.2176 AML other m 2020-10-15T23:25:15.42
IV.CRMI.HHE. ML:1.4 0.00009826675 0.2176 AML other m 2020-10-15T23:25:15.68
IV.CRMI.HNE. ML:1.8 0.00020422895 0.2176 AML other m 2020-10-15T23:25:15.68
IV.TRIF.CHE. ML:1.8 0.00024175020000000004 0.2304 AML other m 2020-10-15T23:25:15.83
IV.TRIF.CHN. ML:1.8 0.00023519065 0.2176 AML other m 2020-10-15T23:25:16.32
IV.RUFI.EHE. ML:1.4 0.00006225194000000001 0.2304 AML other m 2020-10-15T23:25:19.36
IV.RIBO.EHE.01 ML:1.9 0.00016920535 0.1792 AML other m 2020-10-15T23:25:20.16
IV.MPPT.EHE. ML:1.7 0.00010616433999999999 0.192 AML other m 2020-10-15T23:25:20.93
IV.MPPT.EHN. ML:1.6 0.000088790585 0.1536 AML other m 2020-10-15T23:25:20.88
IV.PII.HHN. ML:2.0 0.00024386565 0.3712 AML other m 2020-10-15T23:25:21.36
IV.PII.HHE. ML:1.9 0.00019359114999999998 0.3584 AML other m 2020-10-15T23:25:21.53
IV.RUFI.EHN. ML:1.5 0.000078740175 0.6912 AML other m 2020-10-15T23:25:23.89
GU.POPM.HHN. ML:1.8 0.0001027179 0.1536 AML other m 2020-10-15T23:25:24.83
IV.RINC.HHE. ML:1.4 0.000044044935 0.3328 AML other m 2020-10-15T23:25:25.30
GU.POPM.HHE. ML:1.8 0.00009496368499999999 0.2176 AML other m 2020-10-15T23:25:26.34
IV.RONT.HHE. ML:2.3 0.0003333552 0.4608 AML other m 2020-10-15T23:25:26.71
IV.RINC.HHN. ML:1.5 0.00006445269 0.64 AML other m 2020-10-15T23:25:26.65
IV.RONT.HHN. ML:2.1 0.00021457859000000002 0.2304 AML other m 2020-10-15T23:25:27.13
IV.SEI.HHE. ML:2.0 0.00017921799999999998 0.4352 AML other m 2020-10-15T23:25:27.04
IV.SEI.HHN. ML:2.2 0.00026881905 0.384 AML other m 2020-10-15T23:25:28.22
IV.SSP9.EHE. ML:2.2 0.000185130665 0.4224 AML other m 2020-10-15T23:25:28.36
TV.SF01.EHN. ML:2.0 0.000132187545 0.4352 AML other m 2020-10-15T23:25:28.77
TV.SF01.EHE. ML:1.9 0.000111927385 0.3584 AML other m 2020-10-15T23:25:28.96
IV.BDI.HHN. ML:1.7 0.000076389945 0.4608 AML other m 2020-10-15T23:25:29.17
IV.BDI.HNN. ML:2.1 0.0001879015 0.5504 AML other m 2020-10-15T23:25:29.45
IV.SFI.EHN. ML:1.4 0.000042344319999999995 0.5504 AML other m 2020-10-15T23:25:29.48
IV.SFI.EHE. ML:1.5 0.00005216869000000001 0.7808 AML other m 2020-10-15T23:25:29.82
IV.BDI.HHE. ML:1.6 0.0000603347 0.2816 AML other m 2020-10-15T23:25:31.41
IV.BDI.HNE. ML:1.8 0.00009748159000000001 0.6784 AML other m 2020-10-15T23:25:32.17
IV.SFI.HNN. ML:2.0 0.00013563095 0.9216 AML other m 2020-10-15T23:25:32.96
IV.SFI.HNE. ML:1.9 0.00011534111999999999 0.7936 AML other m 2020-10-15T23:25:34.18
IV.SSP9.EHN. ML:1.8 0.000081231115 1.8816 AML other m 2020-10-15T23:25:50.69
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