Earthquake with magnitude of ML 1.6 on date 28-10-2020 and time 04:09:34 (Italy) in region 2 km W Castiglione d'Orcia (SI)

A magnitude ML 1.6 earthquake occured in region: 2 km W Castiglione d'Orcia (SI), on

  • 28-10-2020 03:09:34 (UTC)
  • 28-10-2020 04:09:34 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43, 11.59 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Castiglione d'Orcia SI 2 2346 2346
San Quirico d'Orcia SI 7 2662 5008
Seggiano GR 9 961 5969
Montalcino SI 10 5093 11062
Pienza SI 11 2107 13169
Castel del Piano GR 13 4690 17859
Arcidosso GR 15 4285 22144
Abbadia San Salvatore SI 15 6444 28588
San Giovanni d'Asso SI 17 853 29441
Buonconvento SI 17 3173 32614
Montepulciano SI 19 14097 46711
Radicofani SI 19 1097 47808
Santa Fiora GR 19 2622 50430
Piancastagnaio SI 19 4230 54660

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km SE of Siena (53903 inhabitants)
47 Km NE of Grosseto (82087 inhabitants)
57 Km SW of Arezzo (99543 inhabitants)
66 Km W of Perugia (166134 inhabitants)
78 Km NW of Viterbo (67173 inhabitants)
90 Km SE of Firenze (382808 inhabitants)
90 Km SE of Scandicci (50609 inhabitants)
91 Km W of Foligno (57155 inhabitants)
99 Km NW of Terni (111501 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 1.6 2020-10-28
03:09:34
43 11.59 9 2021-02-26
14:56:02
Bollettino Sismico Italiano INGV 84415661
Reviewed
Rev100
ML 1.6 2020-10-28
03:09:34
43 11.58 10 2020-10-28
03:19:05
Sala Sismica INGV-Roma 84195081
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-28 03:09:34 ± 0.13
Latitude 43.00 ± 0.01
Longitude 11.59 ± 0.01
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 84415661

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 892
Semi-minor axis of confidence ellipse (meter) 559
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 181
Circular confidence region, given by single value of horizontal uncertainty (meter) 890
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 48
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.33
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.73025
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 84415661
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2020-11-03 13:16:47

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 84195081
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-28 03:19:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.BLLA.EHZ. 2020-10-28T03:10:15.32 3.0 undecidable manual S -0.21 0
IV.POFI.HHZ. 2020-10-28T03:10:11.78 3.0 undecidable manual Pg 4.08 0
IV.ATMI.HHZ. 2020-10-28T03:09:55.40 0.3 undecidable manual S 56 0.5954 50 0.02 71
IV.CASP.HHN. 2020-10-28T03:09:54.90 0.3 undecidable manual S 248 0.5711 50 0.25 68
IV.MURB.HHZ. 2020-10-28T03:09:49.06 0.1 undecidable manual P 69 0.7302 50 0.06 91
IV.MGAB.HHZ. 2020-10-28T03:09:49.30 0.1 undecidable manual S 103 0.393 50 -0.08 97
IV.FROS.CHZ. 2020-10-28T03:09:48.00 0.3 undecidable manual S 303 0.3777 50 -0.93 56
IV.CRE.HHZ. 2020-10-28T03:09:48.34 0.1 undecidable manual P 23 0.67 50 0.37 86
IV.CASP.HHN. 2020-10-28T03:09:46.84 0.1 undecidable manual P 248 0.5711 50 0.57 84
IV.ATMI.HHZ. 2020-10-28T03:09:46.84 0.1 undecidable manual P 56 0.5954 50 0.14 92
IV.TRIF.CHE. 2020-10-28T03:09:45.62 0.1 undecidable manual P 283 0.5135 50 0.32 90
IV.CSNT.HHE. 2020-10-28T03:09:44.58 0.1 undecidable manual P 335 0.518 50 -0.79 77
IV.RIBO.EHZ.01 2020-10-28T03:09:43.36 0.1 undecidable manual P 262 0.4002 50 0 99
IV.MCIV.CHZ. 2020-10-28T03:09:43.70 0.1 undecidable manual S 164 0.2329 109 -0.63 87
IV.MGAB.HHZ. 2020-10-28T03:09:42.96 0.1 undecidable manual P 103 0.393 50 -0.27 93
TV.SF01.EHZ. 2020-10-28T03:09:42.50 0.1 undecidable manual S 186 0.1916 113 -0.35 95
IV.ARCI.HHZ. 2020-10-28T03:09:42.30 0.6 undecidable manual S 209 0.1718 115 0.13 50
IV.FROS.CHZ. 2020-10-28T03:09:42.58 0.1 undecidable manual P 303 0.3777 50 -0.39 91
TV.SF13.HHE. 2020-10-28T03:09:42.50 0.1 undecidable manual S 173 0.1853 114 -0.14 100
TV.SF11.HHE. 2020-10-28T03:09:41.20 0.3 undecidable manual S 154 0.1493 119 -0.18 75
IV.SACS.HHZ. 2020-10-28T03:09:41.51 0.1 undecidable manual P 123 0.2806 50 0.2 97
TV.SF04.EHZ. 2020-10-28T03:09:41.90 0.1 undecidable manual S 163 0.1745 115 -0.36 96
IV.MCIV.CHZ. 2020-10-28T03:09:40.41 0.1 positive manual P 164 0.2329 109 0.09 100
TV.SF03.EHN. 2020-10-28T03:09:40.10 0.1 undecidable manual P 160 0.2122 111 0.22 98
TV.SF14.HHN. 2020-10-28T03:09:40.72 0.1 undecidable manual P 176 0.2482 108 0.08 100
TV.SF04.EHZ. 2020-10-28T03:09:39.39 0.1 undecidable manual P 163 0.1745 115 0.27 97
TV.SF01.EHZ. 2020-10-28T03:09:39.67 0.1 positive manual P 186 0.1916 113 0.21 98
IV.ARCI.HHZ. 2020-10-28T03:09:39.23 0.1 undecidable manual P 209 0.1718 115 0.16 100
TV.SF13.HHE. 2020-10-28T03:09:39.63 0.1 positive manual P 173 0.1853 114 0.29 97
TV.SF11.HHE. 2020-10-28T03:09:38.92 0.1 undecidable manual P 154 0.1493 119 0.31 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF04.EHN. ML:2.1 0.0008985 0.24 AML other m 2020-10-28T03:09:42.31
IV.ARCI.HHN. ML:1.2 0.000118 0.34 AML other m 2020-10-28T03:09:43.07
IV.ARCI.HHE. ML:1.3 0.000172 0.46 AML other m 2020-10-28T03:09:43.68
TV.SF04.EHE. ML:2 0.000752 1 AML other m 2020-10-28T03:09:43.82
TV.SF01.EHN. ML:1.7 0.0003365 0.22 AML other m 2020-10-28T03:09:43.72
TV.SF01.EHE. ML:1.7 0.000331 0.26 AML other m 2020-10-28T03:09:44.51
IV.MCIV.CHN. ML:1.4 0.0001345 1.52 AML other m 2020-10-28T03:09:44.03
IV.MCIV.CHE. ML:1.5 0.0001905 0.22 AML other m 2020-10-28T03:09:46.31
IV.FROS.CHN. ML:1.5 0.0001112 1.48 AML other m 2020-10-28T03:09:48.92
IV.FROS.CHE. ML:1.7 0.0001645 0.2 AML other m 2020-10-28T03:09:49.03
IV.MGAB.HHE. ML:1.4 7.17E-5 0.5 AML other m 2020-10-28T03:09:52.36
IV.MGAB.HHN. ML:1.3 6.47E-5 0.46 AML other m 2020-10-28T03:09:53.89
IV.ATMI.HHN. ML:1.8 0.0001225 1.54 AML other m 2020-10-28T03:09:59.81
IV.ATMI.HHE. ML:1.8 0.0001084 0.44 AML other m 2020-10-28T03:10:00.70
IV.MURB.HHN. ML:2.3 0.00027 0.26 AML other m 2020-10-28T03:10:03.91
IV.MURB.HHE. ML:2 0.0001515 1.74 AML other m 2020-10-28T03:10:03.88
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download