Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 23-01-2020 and time 17:57:11 (Italy) in region 4 km S Radicondoli (SI)

A magnitude ML 1.7 earthquake occured in region: 4 km S Radicondoli (SI), on

  • 23-01-2020 16:57:11 (UTC)
  • 23-01-2020 17:57:11 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.2280, 11.0520 at 6 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
Radicondoli SI 4 914 914
Chiusdino SI 9 1903 2817
Montieri GR 11 1204 4021
Castelnuovo di Val di Cecina PI 12 2231 6252
Casole d'Elsa SI 13 3897 10149
Monticiano SI 14 1571 11720
Sovicille SI 16 10116 21836
Pomarance PI 17 5897 27733
Monterotondo Marittimo GR 18 1371 29104

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km W of Siena (53903 inhabitants)
52 Km N of Grosseto (82087 inhabitants)
60 Km S of Scandicci (50609 inhabitants)
63 Km S of Firenze (382808 inhabitants)
70 Km SE of Livorno (159219 inhabitants)
72 Km W of Arezzo (99543 inhabitants)
73 Km S of Prato (191150 inhabitants)
76 Km SE of Pisa (89158 inhabitants)
79 Km S of Pistoia (90315 inhabitants)
82 Km SE of Lucca (89046 inhabitants)
96 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 1.7 2020-01-23
16:57:11		 43.2277 11.0523 6 2020-07-18
21:08:23		 Bollettino Sismico Italiano INGV 77042861
Reviewed
Rev100 		ML 1.7 2020-01-23
16:57:11		 43.2253 11.0467 9 2020-01-23
17:07:40		 Sala Sismica INGV-Roma 75773451
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-01-23 16:57:11 ± 0.09
Latitude 43.2277 ± 0.0045
Longitude 11.0523 ± 0.0074
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 77042861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 560
Semi-minor axis of confidence ellipse (meter) 196
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 116
Circular confidence region, given by single value of horizontal uncertainty (meter) 560.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 68
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 25
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.07824
Epicentral distance of station farthest from the epicenter (degree) 0.89752
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 17
Type of magnitude ML
Reference to an origin 77042861
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-03-10 15:10:46

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 75773451
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-01-23 17:07:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MAON.HHZ. 2020-01-23T16:57:39.30 0.1 undecidable manual S 176 88.9443 50 0.11 87
IV.RUFI.EHZ. 2020-01-23T16:57:35.70 0.6 undecidable manual S 28 77.0673 50 -0.33 43
TV.SF01.EHZ. 2020-01-23T16:57:31.60 0.3 undecidable manual S 138 61.9935 50 -0.41 65
IV.BDI.HNZ. 2020-01-23T16:57:29.67 0.6 undecidable manual P 339 99.6225 50 0.38 40
IV.CELB.HHZ. 2020-01-23T16:57:28.49 0.3 undecidable manual P 232 86.6466 50 1.2 45
IV.MAON.HHZ. 2020-01-23T16:57:27.95 0.3 undecidable manual P 176 88.9443 50 0.31 63
IV.RUFI.EHZ. 2020-01-23T16:57:26.23 0.6 undecidable manual P 28 77.0673 50 0.42 42
IV.CRMI.HNE. 2020-01-23T16:57:24.10 0.3 undecidable manual P 355 63.2922 50 0.42 64
TV.SF03.EHN. 2020-01-23T16:57:24.39 0.3 undecidable manual P 132 69.6747 50 -0.29 65
IV.PII.HHZ. 2020-01-23T16:57:24.83 1.0 undecidable manual P 322 69.375 50 0.21 22
IV.OSSC.HHZ. 2020-01-23T16:57:24.20 0.3 undecidable manual S 25 36.3414 99 -0.42 68
TV.SF04.EHZ. 2020-01-23T16:57:23.80 0.3 undecidable manual P 131 65.7897 50 -0.27 66
IV.CSNT.HHZ. 2020-01-23T16:57:23.20 0.3 undecidable manual S 35 33.3444 100 -0.38 69
TV.SF01.EHZ. 2020-01-23T16:57:23.41 0.3 undecidable manual P 138 61.9935 50 -0.08 69
IV.MAGO.CHZ. 2020-01-23T16:57:22.60 0.1 undecidable manual S 279 32.2455 100 -0.62 85
IV.RIBO.EHZ.01 2020-01-23T16:57:22.10 0.1 undecidable manual S 181 30.9468 101 -0.66 84
IV.CASP.HHZ. 2020-01-23T16:57:21.65 0.1 undecidable manual P 197 50.8158 50 -0.11 94
IV.OSSC.HHZ. 2020-01-23T16:57:19.14 0.3 undecidable manual P 25 36.3414 99 -0.08 73
IV.MAGO.CHZ. 2020-01-23T16:57:18.57 0.1 undecidable manual P 279 32.2455 100 0.16 96
IV.CSNT.HHZ. 2020-01-23T16:57:18.65 0.3 undecidable manual P 35 33.3444 100 0.03 74
IV.TRIF.CHZ. 2020-01-23T16:57:18.30 0.1 undecidable manual S 224 17.3715 109 0.08 100
IV.RIBO.EHZ.01 2020-01-23T16:57:17.98 0.3 undecidable manual P 181 30.9468 101 -0.17 72
IV.FROS.CHZ. 2020-01-23T16:57:15.80 0.1 undecidable manual S 103 8.6802 124 0.34 96
IV.TRIF.CHZ. 2020-01-23T16:57:15.84 0.3 undecidable manual P 224 17.3715 109 0.32 71
IV.FROS.CHZ. 2020-01-23T16:57:14.43 0.1 positive manual P 103 8.6802 124 0.5 93
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHN. ML:2.4 0.004165 0.38 AML other m 2020-01-23T16:57:16.19
IV.FROS.CHE. ML:2.2 0.0030800000000000003 0.2 AML other m 2020-01-23T16:57:16.09
IV.TRIF.CHN. ML:2.0 0.0009220000000000001 0.8 AML other m 2020-01-23T16:57:19.46
IV.TRIF.CHE. ML:1.9 0.000709 1.26 AML other m 2020-01-23T16:57:19.17
IV.RIBO.EHE.01 ML:1.9 0.00041334039999999997 0.1536 AML other m 2020-01-23T16:57:22.23
IV.MAGO.CHN. ML:1.5 0.000154 0.14 AML other m 2020-01-23T16:57:22.81
IV.CSNT.HHN. ML:1.4 0.00010655 0.16 AML other m 2020-01-23T16:57:23.41
IV.MAGO.CHE. ML:1.4 0.00010735000000000001 1.1 AML other m 2020-01-23T16:57:23.58
IV.CSNT.HHE. ML:1.4 0.00011115 0.54 AML other m 2020-01-23T16:57:23.47
IV.OSSC.HHE. ML:1.0 0.000042058425 0.2432 AML other m 2020-01-23T16:57:24.38
IV.OSSC.HHN. ML:0.9 0.000035293295 0.2176 AML other m 2020-01-23T16:57:24.52
IV.CASP.HHE. ML:1.9 0.0002176656 0.0768 AML other m 2020-01-23T16:57:27.87
TV.SF01.EHN. ML:1.7 0.00010945 1.72 AML other m 2020-01-23T16:57:31.92
TV.SF01.EHE. ML:1.8 0.00012485 1.78 AML other m 2020-01-23T16:57:32.92
IV.PII.HHN. ML:1.4 0.000046649999999999996 1.68 AML other m 2020-01-23T16:57:37.10
IV.PII.HHE. ML:1.5 0.0000539 0.96 AML other m 2020-01-23T16:57:37.63
IV.MAON.HHN. ML:1.7 0.0000664 1.56 AML other m 2020-01-23T16:57:40.16
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