Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 27-10-2020 and time 15:16:51 (Italy) in region 1 km NE Castiglione d'Orcia (SI)

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

  • 27-10-2020 14:16:51 (UTC)
  • 27-10-2020 15:16:51 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.0110, 11.6200 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
Pienza SI 9 2107 7115
Seggiano GR 10 961 8076
Montalcino SI 12 5093 13169
Castel del Piano GR 15 4690 17859
Abbadia San Salvatore SI 15 6444 24303
San Giovanni d'Asso SI 16 853 25156
Montepulciano SI 16 14097 39253
Arcidosso GR 17 4285 43538
Radicofani SI 17 1097 44635
Buonconvento SI 18 3173 47808
Chianciano Terme SI 18 7105 54913
Piancastagnaio SI 19 4230 59143
Santa Fiora GR 20 2622 61765

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km SE of Siena (53903 inhabitants)
50 Km NE of Grosseto (82087 inhabitants)
55 Km SW of Arezzo (99543 inhabitants)
63 Km W of Perugia (166134 inhabitants)
77 Km NW of Viterbo (67173 inhabitants)
88 Km W of Foligno (57155 inhabitants)
89 Km SE of Firenze (382808 inhabitants)
90 Km SE of Scandicci (50609 inhabitants)
98 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
14:16:51		 43.0107 11.6197 10 2020-10-27
14:27:19		 Sala Sismica INGV-Roma 84181311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-27 14:16:51 ± 0.15
Latitude 43.0107 ± 0.0072
Longitude 11.6197 ± 0.0098
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 84181311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 788
Semi-minor axis of confidence ellipse (meter) 770
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 105
Circular confidence region, given by single value of horizontal uncertainty (meter) 790.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 84
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 21
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) 0.14839
Epicentral distance of station farthest from the epicenter (degree) 0.59445
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 23
Type of magnitude ML
Reference to an origin 84181311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-27 14:27:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CASP.HHZ. 2020-10-27T14:17:12.59 0.3 undecidable manual S 249 65.9895 50 0.34 65
IV.CSNT.HHZ. 2020-10-27T14:17:09.76 0.3 undecidable manual S 333 57.7977 50 -0.3 66
IV.CAFI.HHZ. 2020-10-27T14:17:06.14 0.6 undecidable manual S 38 45.1215 50 -0.54 43
IV.CASP.HHZ. 2020-10-27T14:17:04.20 0.3 undecidable manual P 249 65.9895 50 0.54 62
IV.SACS.HHZ. 2020-10-27T14:17:02.52 0.3 undecidable manual S 127 29.6481 50 -0.02 74
IV.CSNT.HHZ. 2020-10-27T14:17:01.80 0.3 undecidable manual P 333 57.7977 50 -0.59 61
IV.MGAB.HHZ. 2020-10-27T14:17:00.43 0.6 undecidable manual P 105 41.4252 50 0.56 43
IV.MCIV.CHZ. 2020-10-27T14:17:00.87 0.3 undecidable manual S 170 26.1516 50 -0.75 61
IV.ARCI.HHZ. 2020-10-27T14:17:00.25 0.3 undecidable manual S 214 21.1677 115 0.23 72
IV.CAFI.HHZ. 2020-10-27T14:17:00.56 0.3 undecidable manual P 38 45.1215 50 0.12 71
TV.SF13.HHE. 2020-10-27T14:16:59.68 0.3 undecidable manual S 180 21.3675 115 -0.4 69
TV.SF04.EHZ. 2020-10-27T14:16:59.36 0.6 undecidable manual S 170 19.6692 117 -0.21 48
TV.SF01.EHZ. 2020-10-27T14:16:59.86 0.3 undecidable manual S 192 22.5552 114 -0.59 65
TV.SF11.HHE. 2020-10-27T14:16:58.49 0.3 undecidable manual S 163 16.4724 121 -0.1 74
IV.SACS.HHZ. 2020-10-27T14:16:58.67 0.3 undecidable manual P 127 29.6481 50 0.62 64
IV.MCIV.CHZ. 2020-10-27T14:16:57.65 0.1 positive manual P 170 26.1516 50 0.13 97
TV.SF04.EHZ. 2020-10-27T14:16:56.63 0.3 undecidable manual P 170 19.6692 117 0.29 71
TV.SF01.EHZ. 2020-10-27T14:16:56.84 0.1 undecidable manual P 192 22.5552 114 -0.01 100
TV.SF11.HHE. 2020-10-27T14:16:56.19 0.3 undecidable manual P 163 16.4724 121 0.42 70
TV.SF13.HHE. 2020-10-27T14:16:56.83 0.1 undecidable manual P 180 21.3675 115 0.2 96
IV.ARCI.HHZ. 2020-10-27T14:16:56.46 0.1 positive manual P 214 21.1677 115 -0.14 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARCI.HHE. ML:1.2 0.00010669096 0.5184 AML other m 2020-10-27T14:17:04.73
IV.ARCI.HHN. ML:1.2 0.00011544238 0.3008 AML other m 2020-10-27T14:17:00.76
TV.SF04.EHE. ML:1.9 0.0005681791000000001 0.2816 AML other m 2020-10-27T14:17:00.98
TV.SF04.EHN. ML:2.0 0.00080118095 0.1408 AML other m 2020-10-27T14:16:59.34
TV.SF01.EHE. ML:1.7 0.00030082545 0.32 AML other m 2020-10-27T14:17:01.72
TV.SF01.EHN. ML:1.8 0.00037630195 0.2368 AML other m 2020-10-27T14:17:00.90
IV.MCIV.CHE. ML:1.2 0.00009495732 0.3136 AML other m 2020-10-27T14:17:02.18
IV.MCIV.CHN. ML:1.3 0.00010494474500000001 0.224 AML other m 2020-10-27T14:17:02.84
IV.SACS.HHE. ML:1.3 0.000092643 4.7616 AML other m 2020-10-27T14:17:05.56
IV.SACS.HNE. ML:1.4 0.00012672316 0.6656 AML other m 2020-10-27T14:16:58.18
IV.SACS.HNN. ML:1.4 0.00013331055 0.9152 AML other m 2020-10-27T14:17:06.73
IV.MGAB.HHE. ML:1.1 0.00003910131999999999 0.256 AML other m 2020-10-27T14:17:08.53
IV.MGAB.HHN. ML:1.2 0.000048788155 0.2432 AML other m 2020-10-27T14:17:11.70
IV.MGAB.HNE. ML:1.5 0.00011348516 0.5376 AML other m 2020-10-27T14:17:10.68
IV.MGAB.HNN. ML:1.8 0.00022709010000000003 1.0368 AML other m 2020-10-27T14:17:21.07
IV.CAFI.HNE. ML:1.6 0.00010972531499999999 0.7616 AML other m 2020-10-27T14:17:11.46
IV.CAFI.HNN. ML:1.5 0.000098084065 0.4864 AML other m 2020-10-27T14:17:12.42
IV.CAFI.HHE. ML:1.1 0.000033661385 0.3392 AML other m 2020-10-27T14:17:09.27
IV.CAFI.HHN. ML:1.3 0.000053652445 0.2624 AML other m 2020-10-27T14:17:07.20
IV.CSNT.HHE. ML:1.2 0.000035574309999999997 0.1408 AML other m 2020-10-27T14:17:11.68
IV.CSNT.HHN. ML:1.4 0.00005297143 0.1024 AML other m 2020-10-27T14:17:10.20
IV.CASP.HHE. ML:1.3 0.000034823835 0.3008 AML other m 2020-10-27T14:17:12.95
IV.CASP.HHN. ML:1.4 0.000037709850000000006 0.3776 AML other m 2020-10-27T14:17:14.86
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