Earthquake with magnitude of ML 1.9 on date 27-10-2020 and time 20:27:19 (Italy) in region 3 km W Castiglione d'Orcia (SI)

A magnitude ML 1.9 earthquake occured in region: 3 km W Castiglione d'Orcia (SI), on

  • 27-10-2020 19:27:19 (UTC)
  • 27-10-2020 20:27:19 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.02, 11.59 at 8 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.

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 3 2346 2346
San Quirico d'Orcia SI 5 2662 5008
Montalcino SI 9 5093 10101
Seggiano GR 10 961 11062
Pienza SI 10 2107 13169
Castel del Piano GR 14 4690 17859
San Giovanni d'Asso SI 15 853 18712
Buonconvento SI 16 3173 21885
Arcidosso GR 17 4285 26170
Abbadia San Salvatore SI 17 6444 32614
Montepulciano SI 18 14097 46711
Radicofani SI 20 1097 47808

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)
79 Km NW of Viterbo (67173 inhabitants)
88 Km SE of Firenze (382808 inhabitants)
89 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
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.9 2020-10-27
19:27:19
43.02 11.59 8 2020-10-27
19:40:43
Sala Sismica INGV-Roma 84188791
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-27 19:27:19 ± 0.14
Latitude 43.02 ± 0.01
Longitude 11.59 ± 0.01
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 84188791

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 935
Semi-minor axis of confidence ellipse (meter) 517
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 168
Circular confidence region, given by single value of horizontal uncertainty (meter) 930
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 49
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.7896
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 17
Magnitude information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 43
Type of magnitude ML
Reference to an origin 84188791
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-27 19:40:43
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.LPEL.HHZ. 2020-10-27T19:28:15.03 3.0 undecidable manual Sn -2.01 0
IV.LRP.EHZ. 2020-10-27T19:28:08.87 3.0 undecidable manual Sn -3.11 0
IV.CADA.HNZ. 2020-10-27T19:28:08.11 3.0 undecidable manual Sn 1.17 0
CH.BERNI.HHZ. 2020-10-27T19:28:07.30 3.0 negative manual Pn -3.37 0
IV.MNTT.EHZ. 2020-10-27T19:28:02.72 3.0 undecidable manual Sn -0.77 0
IV.LRP.EHZ. 2020-10-27T19:27:57.93 3.0 undecidable manual Pg 10.69 0
IV.RMP.HHZ. 2020-10-27T19:27:57.33 3.0 undecidable manual Sn 0.19 0
IV.APEC.HHZ. 2020-10-27T19:27:48.41 3.0 undecidable manual Sn -1.13 0
IV.ATPI.EHZ. 2020-10-27T19:27:44.59 0.6 undecidable manual S 53 0.7347 50 0.59 40
IV.CASP.HHZ. 2020-10-27T19:27:39.51 0.6 undecidable manual S 247 0.5747 50 0.24 45
IV.ATMI.HHZ. 2020-10-27T19:27:39.70 0.6 undecidable manual S 57 0.5891 50 0.03 47
IV.TRIF.CHZ. 2020-10-27T19:27:37.30 0.6 undecidable manual S 281 0.5099 50 -0.04 47
IV.CSNT.HHZ. 2020-10-27T19:27:36.88 1.0 undecidable manual S 335 0.5054 50 -0.32 22
IV.PARC.HHZ. 2020-10-27T19:27:34.29 0.1 undecidable manual P 37 0.7896 50 -0.08 89
IV.MGAB.HHZ. 2020-10-27T19:27:33.92 1.0 undecidable manual S 105 0.3966 50 -0.07 24
IV.ATPI.EHZ. 2020-10-27T19:27:33.58 0.1 undecidable manual P 53 0.7347 50 0.14 88
IV.SSP9.EHZ. 2020-10-27T19:27:33.17 0.1 undecidable manual P 35 0.6835 50 0.62 79
IV.ATVO.HHZ. 2020-10-27T19:27:32.96 0.1 undecidable manual P 58 0.6997 50 0.12 89
IV.CRE.HHZ. 2020-10-27T19:27:32.26 0.1 undecidable manual P 24 0.6574 50 0.14 90
IV.FROS.CHZ. 2020-10-27T19:27:32.40 0.6 undecidable manual S 302 0.3696 50 -0.78 39
IV.ATMI.HHZ. 2020-10-27T19:27:31.12 0.1 undecidable manual P 57 0.5891 50 0.18 91
IV.CASP.HHZ. 2020-10-27T19:27:31.14 0.1 undecidable manual P 247 0.5747 50 0.44 86
IV.SACS.HHZ. 2020-10-27T19:27:30.52 0.6 undecidable manual S 125 0.2887 103 0.09 49
IV.TRIF.CHZ. 2020-10-27T19:27:29.93 0.1 undecidable manual P 281 0.5099 50 0.34 89
IV.CSNT.HHZ. 2020-10-27T19:27:28.85 0.1 undecidable manual P 335 0.5054 50 -0.66 81
IV.ARCI.HHZ. 2020-10-27T19:27:27.14 0.6 undecidable manual S 207 0.1835 111 0.58 44
IV.MCIV.CHZ. 2020-10-27T19:27:27.96 0.6 undecidable manual S 165 0.2464 106 -0.89 39
IV.MGAB.HHZ. 2020-10-27T19:27:27.20 0.1 undecidable manual P 105 0.3966 50 -0.46 89
TV.SF01.EHZ. 2020-10-27T19:27:27.05 0.6 undecidable manual S 185 0.205 109 -0.29 48
IV.CAFI.HHZ. 2020-10-27T19:27:27.59 0.1 undecidable manual P 41 0.4173 50 -0.41 89
IV.FROS.CHZ. 2020-10-27T19:27:26.88 0.1 undecidable manual P 302 0.3696 50 -0.31 92
TV.SF04.EHZ. 2020-10-27T19:27:26.43 0.3 undecidable manual S 164 0.188 110 -0.29 72
IV.SACS.HHZ. 2020-10-27T19:27:25.65 0.1 undecidable manual P 125 0.2887 103 0.04 99
IV.RIBO.EHZ.01 2020-10-27T19:27:24.51 3.0 undecidable manual P 0
IV.MCIV.CHZ. 2020-10-27T19:27:24.72 0.1 undecidable manual P 165 0.2464 106 0.03 100
IV.ARCI.HHZ. 2020-10-27T19:27:23.56 0.1 positive manual P 207 0.1835 111 0.19 98
TV.SF04.EHZ. 2020-10-27T19:27:23.59 1.0 negative manual P 164 0.188 110 0.13 25
TV.SF01.EHZ. 2020-10-27T19:27:23.94 0.1 undecidable manual P 185 0.205 109 0.12 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARCI.HHE. ML:1.9 0.000675237 0.3072 AML other m 2020-10-27T19:27:28.87
IV.ARCI.HHN. ML:2 0.00081277595 0.384 AML other m 2020-10-27T19:27:27.88
TV.SF04.EHE. ML:2.8 0.004819015 0.2304 AML other m 2020-10-27T19:27:27.48
TV.SF04.EHN. ML:2.6 0.0031109715 0.2176 AML other m 2020-10-27T19:27:27.94
TV.SF01.EHE. ML:2.5 0.002174415 0.2304 AML other m 2020-10-27T19:27:28.17
TV.SF01.EHN. ML:2.8 0.0048310115 0.2304 AML other m 2020-10-27T19:27:28.03
IV.RIBO.EHE.01 ML:2.5 0.00096948155 0.1792 AML other m 2020-10-27T19:27:34.92
IV.MCIV.CHN. ML:2 0.00061595205 0.3584 AML other m 2020-10-27T19:27:29.93
IV.MCIV.CHE. ML:2 0.00057931045 0.2688 AML other m 2020-10-27T19:27:30.33
IV.SACS.HHE. ML:1.4 0.00012658761 0.2304 AML other m 2020-10-27T19:27:33.27
IV.SACS.HHN. ML:1.5 0.00014033833 0.3968 AML other m 2020-10-27T19:27:35.76
IV.SACS.HNE. ML:1.5 0.00015376762 0.3328 AML other m 2020-10-27T19:27:34.52
IV.SACS.HNN. ML:1.6 0.00018229355 0.4608 AML other m 2020-10-27T19:27:35.21
IV.FROS.CHN. ML:1.8 0.00021525945 0.4224 AML other m 2020-10-27T19:27:36.95
IV.FROS.CHE. ML:1.9 0.0002766507 0.32 AML other m 2020-10-27T19:27:35.10
IV.MGAB.HHN. ML:1.8 0.0002036573 0.2048 AML other m 2020-10-27T19:27:38.19
IV.MGAB.HNE. ML:1.8 0.00018133253 0.2304 AML other m 2020-10-27T19:27:35.78
IV.MGAB.HNN. ML:1.8 0.0002197439 0.6912 AML other m 2020-10-27T19:27:38.20
IV.MGAB.HHE. ML:1.8 0.0001894506 0.2176 AML other m 2020-10-27T19:27:35.77
IV.CAFI.HHN. ML:1.7 0.00013401165 0.2176 AML other m 2020-10-27T19:27:34.53
IV.CAFI.HNE. ML:1.8 0.0001640858 0.8704 AML other m 2020-10-27T19:27:38.84
IV.CAFI.HNN. ML:1.8 0.0001833829 0.6272 AML other m 2020-10-27T19:27:41.50
IV.CAFI.HHE. ML:1.6 0.0001183453 0.3584 AML other m 2020-10-27T19:27:37.03
IV.CSNT.HHN. ML:1.9 0.00017282465 0.1408 AML other m 2020-10-27T19:27:37.66
IV.CSNT.HHE. ML:1.7 0.000127233395 0.192 AML other m 2020-10-27T19:27:37.38
IV.ATMI.HHN. ML:2.4 0.00046043765 0.4352 AML other m 2020-10-27T19:27:41.94
IV.ATMI.HHE. ML:2.3 0.0003613311 0.3456 AML other m 2020-10-27T19:27:45.29
IV.CASP.HHN. ML:1.9 0.0001523151 0.2688 AML other m 2020-10-27T19:27:41.99
IV.CASP.HHE. ML:1.9 0.00014141095 0.256 AML other m 2020-10-27T19:27:39.97
IV.CRE.HHN. ML:1.7 8.5746805E-5 0.2304 AML other m 2020-10-27T19:27:43.60
IV.CRE.HHE. ML:1.6 7.091528E-5 0.32 AML other m 2020-10-27T19:27:43.85
IV.ATVO.HHN. ML:1.6 6.1688615E-5 0.7808 AML other m 2020-10-27T19:27:52.77
IV.ATVO.HHE. ML:2 0.00013616325 0.3328 AML other m 2020-10-27T19:27:47.39
IV.SSP9.EHE. ML:1.9 0.000111657155 1.4592 AML other m 2020-10-27T19:27:54.57
IV.SSP9.EHN. ML:1.9 0.000111406575 1.5232 AML other m 2020-10-27T19:27:55.70
IV.ATPI.HNN. ML:2 0.000140948 0.6272 AML other m 2020-10-27T19:27:37.25
IV.ATPI.EHE. ML:1.5 4.6678145E-5 0.7808 AML other m 2020-10-27T19:27:48.90
IV.ATPI.EHN. ML:1.8 7.7885665E-5 0.6784 AML other m 2020-10-27T19:27:47.58
IV.ATPI.HNE. ML:2.2 0.0002001596 1.0368 AML other m 2020-10-27T19:27:54.16
IV.PARC.HHN. ML:1.7 5.9015045E-5 0.4736 AML other m 2020-10-27T19:27:55.35
IV.PARC.HHE. ML:1.6 4.8879015E-5 0.9728 AML other m 2020-10-27T19:27:54.52
IV.LRP.EHN. ML:1.3 6.43222E-6 0.768 AML other m 2020-10-27T19:27:57.63
IV.LRP.EHE. ML:2 2.445871E-5 0.8704 AML other m 2020-10-27T19:28:39.23
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