Earthquake with magnitude of ML 1.0 on date 17-10-2021 and time 00:23:55 (UTC) in region 4 km E Buonconvento (SI)

A magnitude ML 1.0 earthquake occured in region: 4 km E Buonconvento (SI), on

  • 17-10-2021 00:23:55 (UTC)
  • 17-10-2021 02:23:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.146, 11.526 at 2 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
Buonconvento SI 4 3173 3173
San Giovanni d'Asso SI 5 853 4026
Montalcino SI 10 5093 9119
Asciano SI 10 7118 16237
Murlo SI 11 2389 18626
San Quirico d'Orcia SI 11 2662 21288
Trequanda SI 13 1254 22542
Monteroni d'Arbia SI 13 9088 31630
Pienza SI 15 2107 33737
Rapolano Terme SI 17 5249 38986
Castiglione d'Orcia SI 17 2346 41332
Sinalunga SI 19 12764 54096

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km SE of Siena (53903 inhabitants)
46 Km SW of Arezzo (99543 inhabitants)
54 Km NE of Grosseto (82087 inhabitants)
70 Km W of Perugia (166134 inhabitants)
73 Km SE of Firenze (382808 inhabitants)
74 Km SE of Scandicci (50609 inhabitants)
89 Km SE of Prato (191150 inhabitants)
94 Km NW of Viterbo (67173 inhabitants)
98 Km W of Foligno (57155 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 1.0 2021-10-17
00:23:55
43.1462 11.526 2 2021-10-17
00:32:52
Sala Sismica INGV-Roma 96665931
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-17 00:23:55 ± 0.1
Latitude 43.1462 ± 0.0054
Longitude 11.5260 ± 0.0099
Depth (km) 2 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96665931

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 840
Semi-minor axis of confidence ellipse (meter) 450
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 242
Circular confidence region, given by single value of horizontal uncertainty (meter) 840
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 61
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) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.27699
Epicentral distance of station farthest from the epicenter (degree) 0.72126
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 15
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.3
Num. used stations 17
Type of magnitude ML
Reference to an origin 96665931
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-17 00:32:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.OSSC.HHZ. 2021-10-17T00:24:11.00 0.6 undecidable manual S 332 0.429 93 -0.73 44
IV.PARC.HHZ. 2021-10-17T00:24:10.33 0.6 undecidable manual P 46 0.7213 50 0.22 48
IV.CSNT.HHZ. 2021-10-17T00:24:08.86 0.3 undecidable manual S 332 0.3687 93 -0.58 70
IV.CRE.HHN. 2021-10-17T00:24:07.70 0.6 undecidable manual P 33 0.5648 50 0.27 49
TV.SF04.EHZ. 2021-10-17T00:24:07.01 0.6 undecidable manual S 162 0.3256 93 -0.76 44
IV.MGAB.HHE. 2021-10-17T00:24:06.27 1.0 undecidable manual P 118 0.4874 92 0.21 25
IV.FROS.CHZ. 2021-10-17T00:24:06.29 0.6 undecidable manual S 283 0.277 94 0.4 50
TV.SF11.HHN. 2021-10-17T00:24:06.28 0.6 undecidable manual S 158 0.2995 94 -0.47 49
IV.ARCI.HHZ. 2021-10-17T00:24:05.94 0.6 undecidable manual S 187 0.2968 94 -0.71 45
IV.TRIF.CHZ. 2021-10-17T00:24:05.38 1.0 undecidable manual P 266 0.456 92 0.03 26
IV.RIBO.EHZ.01 2021-10-17T00:24:04.51 1.0 undecidable manual P 241 0.402 93 0.36 25
IV.OSSC.HHZ. 2021-10-17T00:24:04.55 1.0 negative manual P 332 0.429 93 -0.2 26
IV.SACS.HHE. 2021-10-17T00:24:04.32 0.6 undecidable manual P 137 0.4083 93 0.02 53
IV.MCIV.CHZ. 2021-10-17T00:24:03.81 0.6 undecidable manual P 163 0.3831 93 0.06 53
TV.SF14.HHN. 2021-10-17T00:24:03.98 0.6 undecidable manual P 171 0.3966 93 -0.05 53
IV.CSNT.HHZ. 2021-10-17T00:24:03.22 0.6 positive manual P 332 0.3687 93 -0.2 52
IV.CAFI.HHZ. 2021-10-17T00:24:03.74 0.6 undecidable manual P 60 0.3687 93 0.32 50
TV.SF04.EHZ. 2021-10-17T00:24:02.77 1.0 negative manual P 162 0.3256 93 0.31 25
TV.SF11.HHN. 2021-10-17T00:24:02.31 0.3 undecidable manual P 158 0.2995 94 0.44 75
IV.ARCI.HHZ. 2021-10-17T00:24:02.12 0.6 negative manual P 187 0.2968 94 0.31 51
IV.FROS.CHZ. 2021-10-17T00:24:01.81 0.1 negative manual P 283 0.277 94 0.43 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:1.2 8.3272875E-5 0.328 AML other m 2021-10-17T00:24:07.46
IV.FROS.CHN. ML:1.2 7.3863095E-5 0.184 AML other m 2021-10-17T00:24:06.62
IV.ARCI.HHE. ML:0.9 3.4193555E-5 0.14 AML other m 2021-10-17T00:24:06.99
IV.ARCI.HHN. ML:1 4.4490315E-5 0.12 AML other m 2021-10-17T00:24:08.11
IV.CSNT.HHN. ML:1.2 5.16E-5 0.14 AML other m 2021-10-17T00:24:09.08
IV.CSNT.HHE. ML:1.1 4.0766385E-5 0.12 AML other m 2021-10-17T00:24:09.35
IV.OSSC.HHE. ML:1 3.138842E-5 0.26 AML other m 2021-10-17T00:24:11.57
IV.OSSC.HHN. ML:0.9 2.28075115E-5 0.16 AML other m 2021-10-17T00:24:11.18
IV.ARCI.HNE. ML:0.9 3.73263215E-5 0.22 AML other m 2021-10-17T00:24:07.58
IV.ARCI.HNN. ML:1.1 5.756143E-5 0.27 AML other m 2021-10-17T00:24:07.98
TV.SF04.EHE. ML:0.6 1.708536E-5 1.88 AML other m 2021-10-17T00:24:15.19
TV.SF04.EHN. ML:1.4 0.000104135995 0.24 AML other m 2021-10-17T00:24:09.70
IV.CAFI.HNE. ML:1.3 6.3814375E-5 0.69 AML other m 2021-10-17T00:24:09.11
IV.CAFI.HNN. ML:1.7 0.00017822519 0.7 AML other m 2021-10-17T00:24:09.11
IV.CAFI.HHE. ML:0.6 1.728558E-5 0.56 AML other m 2021-10-17T00:24:11.62
IV.CAFI.HHN. ML:0.6 1.3691133E-5 0.22 AML other m 2021-10-17T00:24:11.20
IV.RIBO.EHE.01 ML:0.8 2.154024E-5 0.24 AML other m 2021-10-17T00:24:11.61
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