Earthquake with magnitude of ML 1.9 on date 28-10-2020 and time 04:49:40 (Italy) in region 2 km W Castiglione d'Orcia (SI)

A magnitude ML 1.9 earthquake occured in region: 2 km W Castiglione d'Orcia (SI), on

  • 28-10-2020 03:49:40 (UTC)
  • 28-10-2020 04:49:40 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.01, 11.59 at 8 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 6 2662 5008
Seggiano GR 9 961 5969
Montalcino SI 10 5093 11062
Pienza SI 11 2107 13169
Castel del Piano GR 14 4690 17859
Arcidosso GR 16 4285 22144
San Giovanni d'Asso SI 16 853 22997
Abbadia San Salvatore SI 16 6444 29441
Buonconvento SI 17 3173 32614
Montepulciano SI 18 14097 46711
Radicofani SI 19 1097 47808
Santa Fiora GR 20 2622 50430
Piancastagnaio SI 20 4230 54660

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km SE of Siena (53903 inhabitants)
48 Km NE of Grosseto (82087 inhabitants)
56 Km SW of Arezzo (99543 inhabitants)
66 Km W of Perugia (166134 inhabitants)
78 Km NW of Viterbo (67173 inhabitants)
89 Km SE of Firenze (382808 inhabitants)
90 Km SE of Scandicci (50609 inhabitants)
91 Km W of Foligno (57155 inhabitants)
100 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 1.9 2020-10-28
03:49:40
43.01 11.59 8 2021-02-26
14:56:02
Bollettino Sismico Italiano INGV 84416301
Reviewed
Rev100
ML 1.9 2020-10-28
03:49:40
43.01 11.61 10 2020-10-28
04:18:34
Sala Sismica INGV-Roma 84196821
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-28 03:49:40 ± 0.12
Latitude 43.01 ± 0.01
Longitude 11.59 ± 0.01
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 84416301

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 799
Semi-minor axis of confidence ellipse (meter) 458
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 165
Circular confidence region, given by single value of horizontal uncertainty (meter) 800
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 51
Number of defining phases 46
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) 0.95148
Number of stations at which the event was observed 31
Number of stations from which data was used for origin computation 26
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 34
Type of magnitude ML
Reference to an origin 84196821
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-28 04:18:34

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 34
Type of magnitude ML
Reference to an origin 84416301
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-11 12:44:51
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PTRJ.HNZ. 2020-10-28T03:51:04.83 3.0 undecidable manual Sg 4.01 0
OT.OT05.EHZ. 2020-10-28T03:50:34.81 3.0 undecidable manual Pn 2.58 0
IV.POFI.HHZ. 2020-10-28T03:50:21.06 3.0 undecidable manual Pg 5.92 0
IV.LAV9.HHZ. 2020-10-28T03:50:08.84 3.0 positive manual Pg 0.55 0
IV.ATPI.EHZ. 2020-10-28T03:50:05.82 1.0 undecidable manual S 53 0.7383 50 0.44 21
IV.MURB.HHZ. 2020-10-28T03:50:05.60 0.6 undecidable manual S 69 0.7276 50 0.51 41
IV.CRE.HHZ. 2020-10-28T03:50:03.50 0.1 undecidable manual S 23 0.6628 50 0.34 86
IV.CASP.HHZ. 2020-10-28T03:50:00.64 0.3 undecidable manual S 248 0.5729 50 0.14 69
IV.ATMI.HHZ. 2020-10-28T03:50:00.62 1.0 undecidable manual S 57 0.5918 50 -0.43 21
IV.FDMO.HHZ. 2020-10-28T03:50:00.28 3.0 undecidable manual Pn -2.16 0
IV.CSNT.HHZ. 2020-10-28T03:49:58.08 0.6 undecidable manual S 335 0.5108 50 -0.56 42
IV.PE3.EHZ. 2020-10-28T03:49:58.89 0.3 undecidable manual P 44 0.9515 50 0.42 60
IV.TRIF.CHZ. 2020-10-28T03:49:58.15 0.3 undecidable manual S 282 0.5117 50 -0.51 64
IV.RIBO.EHZ.01 2020-10-28T03:49:56.03 0.6 undecidable manual S 261 0.4011 50 0.64 42
IV.ATFO.HHZ. 2020-10-28T03:49:55.98 0.3 undecidable manual P 63 0.7995 50 0.1 66
IV.MGAB.HHZ. 2020-10-28T03:49:55.53 0.6 undecidable manual S 104 0.3957 50 0.3 46
IV.PARC.HHZ. 2020-10-28T03:49:55.77 0.1 undecidable manual P 36 0.7941 50 -0.01 90
IV.ATPI.EHZ. 2020-10-28T03:49:54.84 0.3 undecidable manual P 53 0.7383 50 0.01 68
IV.BADI.EHZ. 2020-10-28T03:49:54.21 0.3 undecidable manual P 44 0.6907 50 0.2 66
IV.MURB.HHZ. 2020-10-28T03:49:54.91 0.3 undecidable manual P 69 0.7276 50 0.26 65
IV.SSP9.EHZ. 2020-10-28T03:49:54.36 0.3 undecidable manual P 35 0.688 50 0.4 63
IV.ATVO.HHZ. 2020-10-28T03:49:54.34 0.3 undecidable manual P 58 0.7024 50 0.12 67
IV.CAFI.HHZ. 2020-10-28T03:49:54.46 0.6 undecidable manual S 41 0.4209 50 -1.53 27
IV.FROS.CHZ. 2020-10-28T03:49:53.68 0.6 undecidable manual S 302 0.3723 50 -0.88 38
IV.CRE.HHZ. 2020-10-28T03:49:53.67 0.1 undecidable manual P 23 0.6628 50 0.13 90
IV.CASP.HHZ. 2020-10-28T03:49:52.43 0.3 undecidable manual P 248 0.5729 50 0.43 65
IV.ATMI.HHZ. 2020-10-28T03:49:52.72 0.3 undecidable manual P 57 0.5918 50 0.4 65
IV.SACS.HHZ. 2020-10-28T03:49:51.55 0.6 undecidable manual S 124 0.2851 104 -0.2 48
IV.TRIF.CHZ. 2020-10-28T03:49:51.31 0.1 undecidable manual P 282 0.5117 50 0.36 88
IV.CSNT.HHZ. 2020-10-28T03:49:50.16 0.1 undecidable manual P 335 0.5108 50 -0.77 77
TV.SF14.HHN. 2020-10-28T03:49:49.65 0.6 undecidable manual S 176 0.2563 106 -1.01 36
TV.SF01.EHZ. 2020-10-28T03:49:49.04 0.3 undecidable manual S 185 0.1996 110 0.46 69
IV.RIBO.EHZ.01 2020-10-28T03:49:49.06 0.1 positive manual P 261 0.4011 50 0 97
IV.MCIV.CHZ. 2020-10-28T03:49:49.47 0.6 undecidable manual S 164 0.241 107 -0.62 43
IV.CAFI.HHZ. 2020-10-28T03:49:48.91 0.1 undecidable manual P 41 0.4209 50 -0.49 88
TV.SF13.HHE. 2020-10-28T03:49:48.13 0.1 undecidable manual S 173 0.1934 111 -0.24 97
IV.MGAB.HHZ. 2020-10-28T03:49:48.52 0.1 undecidable manual P 104 0.3957 50 -0.45 89
IV.FROS.CHZ. 2020-10-28T03:49:48.28 0.1 undecidable manual P 302 0.3723 50 -0.3 92
IV.ARCI.HHZ. 2020-10-28T03:49:48.14 0.3 undecidable manual S 208 0.179 112 0.3 72
TV.SF03.EHN. 2020-10-28T03:49:48.80 0.1 undecidable manual S 161 0.2194 108 -0.52 90
TV.SF04.EHZ. 2020-10-28T03:49:47.69 0.1 undecidable manual S 163 0.1826 112 -0.29 96
IV.SACS.HHZ. 2020-10-28T03:49:46.94 0.1 undecidable manual P 124 0.2851 104 -0.01 100
TV.SF11.HHZ. 2020-10-28T03:49:46.95 0.1 undecidable manual S 155 0.1565 115 -0.11 100
IV.MCIV.CHZ. 2020-10-28T03:49:46.10 0.1 positive manual P 164 0.241 107 0.1 99
TV.SF14.HHN. 2020-10-28T03:49:46.35 0.1 positive manual P 176 0.2563 106 0.03 100
TV.SF01.EHZ. 2020-10-28T03:49:45.31 0.1 positive manual P 185 0.1996 110 0.18 98
TV.SF03.EHN. 2020-10-28T03:49:45.74 0.1 positive manual P 161 0.2194 108 0.19 97
TV.SF04.EHZ. 2020-10-28T03:49:45.04 0.1 undecidable manual P 163 0.1826 112 0.26 96
TV.SF13.HHE. 2020-10-28T03:49:45.29 0.1 positive manual P 173 0.1934 111 0.29 96
IV.ARCI.HHZ. 2020-10-28T03:49:44.90 0.1 positive manual P 208 0.179 112 0.2 98
TV.SF11.HHZ. 2020-10-28T03:49:44.42 0.1 undecidable manual P 155 0.1565 115 0.17 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF04.EHN. ML:2.3 0.00151 0.32 AML other m 2020-10-28T03:49:48.70
TV.SF04.EHE. ML:2.4 0.00203 1.44 AML other m 2020-10-28T03:49:48.25
IV.ARCI.HHN. ML:1.8 0.0005835 0.48 AML other m 2020-10-28T03:49:49.47
TV.SF01.EHE. ML:2.3 0.001285 0.26 AML other m 2020-10-28T03:49:49.41
TV.SF01.EHN. ML:2.6 0.00251 0.26 AML other m 2020-10-28T03:49:49.39
IV.ARCI.HHE. ML:1.9 0.0006095 0.8 AML other m 2020-10-28T03:49:50.62
IV.MCIV.CHN. ML:1.8 0.0003595 0.36 AML other m 2020-10-28T03:49:51.15
IV.MCIV.CHE. ML:1.7 0.0002835 0.58 AML other m 2020-10-28T03:49:53.59
IV.FROS.CHN. ML:1.9 0.000266 0.18 AML other m 2020-10-28T03:49:54.66
IV.FROS.CHE. ML:2 0.000321 1.38 AML other m 2020-10-28T03:49:55.78
IV.CAFI.HHN. ML:1.6 0.00010965 1.12 AML other m 2020-10-28T03:49:56.17
IV.SACS.HHN. ML:1.4 0.0001285 1.34 AML other m 2020-10-28T03:49:57.10
IV.MGAB.HHE. ML:1.6 0.000135 1.38 AML other m 2020-10-28T03:49:57.93
IV.MGAB.HHN. ML:1.7 0.0001455 1.04 AML other m 2020-10-28T03:49:58.12
IV.CAFI.HHE. ML:1.6 0.00010315 0.38 AML other m 2020-10-28T03:49:58.36
IV.CSNT.HHE. ML:1.8 0.0001305 0.4 AML other m 2020-10-28T03:49:58.48
IV.CSNT.HHN. ML:1.8 0.0001515 1.42 AML other m 2020-10-28T03:49:58.17
IV.TRIF.CHE. ML:2 0.0001975 0.12 AML other m 2020-10-28T03:49:59.23
IV.TRIF.CHN. ML:2 0.0002165 0.12 AML other m 2020-10-28T03:49:59.64
IV.ATMI.HHN. ML:2.3 0.0003535 0.4 AML other m 2020-10-28T03:50:03.27
IV.ATMI.HHE. ML:2.2 0.00029 0.34 AML other m 2020-10-28T03:50:03.45
IV.CRE.HHN. ML:1.8 0.0001055 1.3 AML other m 2020-10-28T03:50:05.71
IV.SACS.HHE. ML:1.3 8.595E-5 1.58 AML other m 2020-10-28T03:50:05.06
IV.CRE.HHE. ML:1.8 9.98E-5 0.3 AML other m 2020-10-28T03:50:05.81
IV.BADI.EHE. ML:1.7 7.715E-5 1 AML other m 2020-10-28T03:50:07.03
IV.BADI.EHN. ML:1.6 6.27E-5 0.94 AML other m 2020-10-28T03:50:08.33
IV.MURB.HHN. ML:2.8 0.000858 0.28 AML other m 2020-10-28T03:50:09.51
IV.MURB.HHE. ML:2.3 0.000291 0.24 AML other m 2020-10-28T03:50:09.48
IV.MURB.HNE. ML:2.5 0.0003965 0.86 AML other m 2020-10-28T03:50:09.06
IV.MURB.HNN. ML:2.7 0.000756 0.28 AML other m 2020-10-28T03:50:09.51
IV.ATPI.EHN. ML:1.6 5.4E-5 0.38 AML other m 2020-10-28T03:50:09.93
IV.ATPI.EHE. ML:1.7 6.58E-5 0.42 AML other m 2020-10-28T03:50:10.24
IV.ATFO.HHE. ML:1.8 8.09E-5 1.24 AML other m 2020-10-28T03:50:12.90
IV.ATFO.HHN. ML:1.6 5.02E-5 0.48 AML other m 2020-10-28T03:50:14.32
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