Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 27-10-2020 and time 17:27:04 (Italy) in region 1 km W Castiglione d'Orcia (SI)

A magnitude ML 1.4 earthquake occured in region: 1 km W Castiglione d'Orcia (SI), on

  • 27-10-2020 16:27:04 (UTC)
  • 27-10-2020 17:27:04 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.0090, 11.6020 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Castiglione d'Orcia SI 1 2346 2346
San Quirico d'Orcia SI 6 2662 5008
Seggiano GR 10 961 5969
Pienza SI 10 2107 8076
Montalcino SI 11 5093 13169
Castel del Piano GR 14 4690 17859
Abbadia San Salvatore SI 15 6444 24303
Arcidosso GR 16 4285 28588
San Giovanni d'Asso SI 16 853 29441
Montepulciano SI 17 14097 43538
Buonconvento SI 17 3173 46711
Radicofani SI 18 1097 47808
Piancastagnaio SI 19 4230 52038
Chianciano Terme SI 20 7105 59143
Santa Fiora GR 20 2622 61765

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km SE of Siena (53903 inhabitants)
48 Km NE of Grosseto (82087 inhabitants)
56 Km SW of Arezzo (99543 inhabitants)
65 Km W of Perugia (166134 inhabitants)
78 Km NW of Viterbo (67173 inhabitants)
89 Km SE of Firenze (382808 inhabitants)
90 Km W of Foligno (57155 inhabitants)
90 Km SE of Scandicci (50609 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
Reviewed
Rev100 		ML 1.4 2020-10-27
16:27:04		 43.0087 11.6025 10 2020-10-27
16:36:31		 Sala Sismica INGV-Roma 84184581
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-27 16:27:04 ± 0.16
Latitude 43.0087 ± 0.0081
Longitude 11.6025 ± 0.0111
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 84184581

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 953
Semi-minor axis of confidence ellipse (meter) 793
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 208
Circular confidence region, given by single value of horizontal uncertainty (meter) 950.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 130
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 19
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.58186
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 19
Type of magnitude ML
Reference to an origin 84184581
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-27 16:36:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RCAV.EHZ. 2020-10-27T16:27:29.77 3.0 undecidable manual P -1.54 0
IV.CASP.HHZ. 2020-10-27T16:27:24.20 0.6 undecidable manual S 248 64.5909 50 0.27 44
IV.CSNT.HHZ. 2020-10-27T16:27:22.00 0.3 undecidable manual S 334 57.3981 50 0 71
IV.ATMI.HHZ. 2020-10-27T16:27:18.94 3.0 undecidable manual P 0
IV.FROS.CHZ. 2020-10-27T16:27:17.51 0.6 undecidable manual S 302 42.4242 50 -0.51 43
IV.CASP.HHZ. 2020-10-27T16:27:16.22 0.3 undecidable manual P 248 64.5909 50 0.68 59
IV.CSNT.HHZ. 2020-10-27T16:27:13.95 0.1 undecidable manual P 334 57.3981 50 -0.48 85
IV.MCIV.CHZ. 2020-10-27T16:27:13.06 0.3 undecidable manual S 167 26.2515 50 -0.63 64
IV.ARCI.HHZ. 2020-10-27T16:27:12.37 0.3 undecidable manual S 211 20.1687 117 0.42 69
IV.MGAB.HHZ. 2020-10-27T16:27:12.40 0.3 undecidable manual P 104 42.7239 50 0.23 69
TV.SF01.EHZ. 2020-10-27T16:27:12.03 0.3 undecidable manual S 188 22.0668 115 -0.49 68
IV.RIBO.EHE.01 2020-10-27T16:27:12.71 0.3 undecidable manual P 262 45.621 50 0.1 71
IV.FROS.CHZ. 2020-10-27T16:27:11.98 0.3 undecidable manual P 302 42.4242 50 -0.15 71
TV.SF04.EHZ. 2020-10-27T16:27:11.41 0.3 undecidable manual S 166 19.7691 118 -0.4 70
TV.SF11.HHE. 2020-10-27T16:27:10.70 0.3 undecidable manual S 158 16.7721 122 -0.2 73
IV.SACS.HHZ. 2020-10-27T16:27:10.86 0.3 undecidable manual P 125 30.5472 50 0.56 65
IV.MCIV.CHZ. 2020-10-27T16:27:09.73 0.1 undecidable manual P 167 26.2515 50 0.11 98
TV.SF01.EHZ. 2020-10-27T16:27:08.99 0.3 positive manual P 188 22.0668 115 0.04 75
TV.SF11.HHE. 2020-10-27T16:27:08.19 0.6 undecidable manual P 158 16.7721 122 0.18 49
IV.ARCI.HHZ. 2020-10-27T16:27:08.58 0.1 positive manual P 211 20.1687 117 -0.04 100
TV.SF04.EHZ. 2020-10-27T16:27:08.87 0.1 undecidable manual P 166 19.7691 118 0.33 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARCI.HHE. ML:1.2 0.00011587511 0.1152 AML other m 2020-10-27T16:27:12.48
IV.ARCI.HHN. ML:1.1 0.000101096215 0.2432 AML other m 2020-10-27T16:27:13.02
TV.SF04.EHE. ML:1.8 0.00049796835 0.2432 AML other m 2020-10-27T16:27:13.10
TV.SF04.EHN. ML:2.0 0.0007117259000000001 0.1024 AML other m 2020-10-27T16:27:11.48
TV.SF01.EHE. ML:1.6 0.00027811495 0.2304 AML other m 2020-10-27T16:27:13.70
TV.SF01.EHN. ML:1.7 0.00035856120000000004 0.2688 AML other m 2020-10-27T16:27:13.15
IV.MCIV.CHE. ML:1.3 0.00010995652 0.2432 AML other m 2020-10-27T16:27:15.74
IV.MCIV.CHN. ML:1.2 0.00008803363999999999 0.1152 AML other m 2020-10-27T16:27:13.35
IV.SACS.HHN. ML:1.0 0.000048425944999999996 0.5888 AML other m 2020-10-27T16:27:20.76
IV.SACS.HNE. ML:1.4 0.00010638264999999999 0.6656 AML other m 2020-10-27T16:27:15.80
IV.FROS.CHE. ML:1.6 0.0001204545 0.1664 AML other m 2020-10-27T16:27:18.36
IV.FROS.CHN. ML:1.4 0.00008820482 0.1536 AML other m 2020-10-27T16:27:18.32
IV.MGAB.HHE. ML:1.0 0.000037219255 0.256 AML other m 2020-10-27T16:27:24.40
IV.MGAB.HHN. ML:1.2 0.00005359507 0.256 AML other m 2020-10-27T16:27:23.83
IV.MGAB.HNE. ML:1.6 0.00012722165 1.0112 AML other m 2020-10-27T16:27:27.39
IV.MGAB.HNN. ML:1.6 0.00011740924999999999 0.448 AML other m 2020-10-27T16:27:21.45
IV.CSNT.HHE. ML:1.1 0.00002513875835 0.192 AML other m 2020-10-27T16:27:23.80
IV.CSNT.HHN. ML:1.3 0.000047386335 0.1152 AML other m 2020-10-27T16:27:22.35
IV.CASP.HHE. ML:1.3 0.000035825205 0.2688 AML other m 2020-10-27T16:27:24.93
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