Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 19-09-2020 and time 15:12:45 (Italy) in region 4 km W Chiusdino (SI)

A magnitude ML 1.3 earthquake occured in region: 4 km W Chiusdino (SI), on

  • 19-09-2020 13:12:45 (UTC)
  • 19-09-2020 15:12:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1660, 11.0420 at 9 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Chiusdino SI 4 1903 1903
Montieri GR 4 1204 3107
Radicondoli SI 11 914 4021
Monticiano SI 12 1571 5592
Castelnuovo di Val di Cecina PI 12 2231 7823
Monterotondo Marittimo GR 15 1371 9194
Massa Marittima GR 18 8375 17569
Casole d'Elsa SI 20 3897 21466
Sovicille SI 20 10116 31582
Roccastrada GR 20 9199 40781

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SW of Siena (53903 inhabitants)
45 Km N of Grosseto (82087 inhabitants)
67 Km S of Scandicci (50609 inhabitants)
69 Km S of Firenze (382808 inhabitants)
73 Km SE of Livorno (159219 inhabitants)
76 Km W of Arezzo (99543 inhabitants)
80 Km S of Prato (191150 inhabitants)
80 Km SE of Pisa (89158 inhabitants)
86 Km S of Pistoia (90315 inhabitants)
87 Km SE of Lucca (89046 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 1.3 2020-09-19
13:12:45		 43.1657 11.042 9 2021-02-26
14:56:19		 Bollettino Sismico Italiano INGV 87176141
Reviewed
Rev100 		ML 1.3 2020-09-19
13:12:46		 43.1433 11.1072 9 2020-09-19
13:56:13		 Sala Sismica INGV-Roma 83030421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-09-19 13:12:45 ± 0.2
Latitude 43.1657 ± 0.0117
Longitude 11.0420 ± 0.0173
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87176141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1360
Semi-minor axis of confidence ellipse (meter) 1151
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 110
Circular confidence region, given by single value of horizontal uncertainty (meter) 1360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.41
Epicentral distance of station closest to the epicenter (degree) 0.09443
Epicentral distance of station farthest from the epicenter (degree) 0.39660
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 87176141
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-15 10:43:47

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 83030421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-09-19 13:56:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CASP.HHZ. 2020-09-19T13:13:00.21 0.6 undecidable manual S 199 44.0226 50 -0.28 46
IV.MAGO.CHE. 2020-09-19T13:12:56.66 0.6 undecidable manual S 291 33.2445 50 -0.96 37
IV.CASP.HHZ. 2020-09-19T13:12:54.83 0.3 undecidable manual P 199 44.0226 50 0.5 65
IV.RIBO.EHZ.01 2020-09-19T13:12:54.24 0.6 undecidable manual S 179 24.0537 111 -0.62 43
IV.MAGO.CHE. 2020-09-19T13:12:52.93 0.3 undecidable manual P 291 33.2445 50 0.26 70
IV.RIBO.EHZ.01 2020-09-19T13:12:51.21 0.3 undecidable manual P 179 24.0537 111 0.14 73
IV.TRIF.CHZ. 2020-09-19T13:12:51.14 0.6 undecidable manual S 243 12.5763 127 -0.22 49
IV.FROS.CHZ. 2020-09-19T13:12:50.31 0.6 undecidable manual S 62 10.4784 132 -0.46 47
IV.TRIF.CHZ. 2020-09-19T13:12:49.54 0.3 undecidable manual P 243 12.5763 127 0.49 69
IV.FROS.CHZ. 2020-09-19T13:12:48.84 0.1 undecidable manual P 62 10.4784 132 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:1.6 0.00048499999999999997 0.62 AML other m 2020-09-19T13:12:50.39
IV.FROS.CHN. ML:1.4 0.0003255 1 AML other m 2020-09-19T13:12:50.91
IV.TRIF.CHE. ML:1.1 0.00014150000000000002 0.14 AML other m 2020-09-19T13:12:51.47
IV.TRIF.CHN. ML:1.0 0.00011800000000000001 0.66 AML other m 2020-09-19T13:12:52.96
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