Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 12-02-2023 and time 19:46:21 (Italy) in region 2 km E Siena (SI)

A magnitude ML 1.7 earthquake occured in region: 2 km E Siena (SI), on

  • 12-02-2023 18:46:21 (UTC)
  • 12-02-2023 19:46:21 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.3180, 11.3570 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.

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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
Siena SI 2 53903 53903
Monteroni d'Arbia SI 11 9088 62991
Sovicille SI 11 10116 73107
Castelnuovo Berardenga SI 12 9097 82204
Monteriggioni SI 14 9810 92014
Murlo SI 17 2389 94403
Castellina in Chianti SI 18 2859 97262
Gaiole in Chianti SI 18 2758 100020
Asciano SI 19 7118 107138
Radda in Chianti SI 19 1613 108751

Municipalities with at least 50000 inhabitants

An earthquake occurred to
2 Km E of Siena (53903 inhabitants)
46 Km W of Arezzo (99543 inhabitants)
51 Km S of Firenze (382808 inhabitants)
51 Km S of Scandicci (50609 inhabitants)
65 Km NE of Grosseto (82087 inhabitants)
66 Km SE of Prato (191150 inhabitants)
77 Km SE of Pistoia (90315 inhabitants)
87 Km W of Perugia (166134 inhabitants)
89 Km E of Livorno (159219 inhabitants)
89 Km SE of Pisa (89158 inhabitants)
90 Km SE of Lucca (89046 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 1.7 2023-02-12
18:46:21		 43.3175 11.3568 8 2024-03-01
17:18:04		 Bollettino Sismico Italiano INGV 116464961
Reviewed
Rev100 		ML 1.7 2023-02-12
18:46:21		 43.3257 11.3462 9 2023-02-12
18:51:57		 Sala Sismica INGV-Roma 114390371
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-12 18:46:21 ± 0.09
Latitude 43.3175 ± 0.0036
Longitude 11.3568 ± 0.0087
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 116464961

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 566
Semi-minor axis of confidence ellipse (meter) 446
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 285
Circular confidence region, given by single value of horizontal uncertainty (meter) 570.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 65
Number of associated phases, regardless of their use for origin computation 55
Number of defining phases 51
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.01354
Number of stations at which the event was observed 36
Number of stations from which data was used for origin computation 33
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 28
Type of magnitude ML
Reference to an origin 116464961
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-04-17 17:07:02

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 28
Type of magnitude ML
Reference to an origin 114390371
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-12 18:51:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MC2.EHZ. 2023-02-12T18:47:06.51 3.0 undecidable manual S -0.66 0
IV.SEI.HHZ. 2023-02-12T18:46:47.00 3.0 undecidable manual S -1.36 0
IV.MGAB.HHZ. 2023-02-12T18:46:45.90 1.0 undecidable manual S 126 75.8685 50 1.03 17
IV.PII.HHZ. 2023-02-12T18:46:45.80 1.0 undecidable manual S 304 80.5638 50 -0.32 22
IV.SACS.HHZ. 2023-02-12T18:46:43.50 1.0 undecidable manual S 139 68.5758 50 0.57 21
IV.CASP.HHZ. 2023-02-12T18:46:43.80 1.0 undecidable manual S 214 70.6737 50 0.31 22
IV.CELB.HHZ. 2023-02-12T18:46:42.13 1.0 undecidable manual P 236 112.4985 50 1.48 12
IV.BOSL.HHE. 2023-02-12T18:46:42.50 1.0 undecidable manual S 1 68.0763 50 -0.28 22
IV.CRE.HHZ. 2023-02-12T18:46:40.60 1.0 undecidable manual S 55 58.3971 50 0.4 22
IV.CRMI.HHZ. 2023-02-12T18:46:40.30 1.0 undecidable manual S 330 61.0944 50 -0.62 21
IV.BDI.HHZ. 2023-02-12T18:46:39.78 0.6 undecidable manual P 324 102.8193 50 0.62 38
Y1.T1756.HNZ. 2023-02-12T18:46:39.91 1.0 undecidable manual P 36 101.7204 50 0.9 17
GU.POPM.HHZ. 2023-02-12T18:46:39.17 3.0 positive manual P 93.9393 1.37 0
IV.RUFI.EHE. 2023-02-12T18:46:39.30 1.0 undecidable manual S 12 58.9965 50 -1.07 17
TV.SF11.HHZ. 2023-02-12T18:46:38.40 3.0 undecidable manual S 152 56.1993 50 -1.22 0
IV.LMD.HHZ. 2023-02-12T18:46:37.33 1.0 undecidable manual P 18 88.8444 50 0.31 21
IV.ARCI.HHZ. 2023-02-12T18:46:37.60 1.0 undecidable manual S 169 52.503 50 -1.03 17
GU.MAIM.HHZ. 2023-02-12T18:46:37.60 1.0 undecidable manual P 314 95.9262 50 -0.5 20
IV.PII.HHZ. 2023-02-12T18:46:36.42 1.0 undecidable manual P 304 80.5638 50 0.69 19
IV.CAFI.HHZ. 2023-02-12T18:46:36.80 1.0 undecidable manual S 88 49.2174 50 -0.95 18
IV.ATPI.EHZ. 2023-02-12T18:46:36.87 0.6 undecidable manual P 80 85.5477 50 0.36 42
IV.MPPT.EHN. 2023-02-12T18:46:35.08 0.6 undecidable manual P 343 74.1702 50 0.33 44
IV.PARC.HHZ. 2023-02-12T18:46:35.87 0.3 undecidable manual P 62 79.9644 50 0.23 66
IV.SFI.EHZ. 2023-02-12T18:46:35.30 1.0 undecidable manual P 31 76.1682 50 0.25 22
IV.BADI.EHE. 2023-02-12T18:46:35.23 0.3 undecidable manual P 73 74.6697 50 0.41 64
IV.MGAB.HHZ. 2023-02-12T18:46:35.45 0.6 undecidable manual P 126 75.8685 50 0.44 42
IV.TRIF.CHZ. 2023-02-12T18:46:35.60 1.0 undecidable manual S 239 43.0236 50 -0.5 22
IV.CASP.HHZ. 2023-02-12T18:46:34.97 0.3 undecidable manual P 214 70.6737 50 0.75 57
IV.ATMC.EHE. 2023-02-12T18:46:34.07 0.6 undecidable manual P 78 68.8755 50 0.13 46
IV.ATMI.HHZ. 2023-02-12T18:46:34.63 1.0 undecidable manual P 88 73.5708 50 -0.02 23
IV.SACS.HHZ. 2023-02-12T18:46:34.38 0.6 undecidable manual P 139 68.5758 50 0.49 43
IV.VMGN.HHN. 2023-02-12T18:46:34.95 0.3 undecidable manual P 11 72.0723 50 0.53 63
IV.MALA5.EHN. 2023-02-12T18:46:33.30 0.6 undecidable manual S 164 35.8419 50 -0.88 39
IV.MALA4.EHZ. 2023-02-12T18:46:33.40 1.0 undecidable manual S 164 35.9418 50 -0.81 20
IV.MALA1.EHN. 2023-02-12T18:46:33.40 1.0 undecidable manual S 164 36.1416 50 -0.86 20
IV.BOSL.HHE. 2023-02-12T18:46:33.78 0.3 undecidable manual P 1 68.0763 50 -0.03 70
IV.MALA2.EHN. 2023-02-12T18:46:33.50 1.0 undecidable manual S 164 36.1416 50 -0.77 20
IV.MCIV.CHE. 2023-02-12T18:46:33.42 0.3 undecidable manual P 156 65.1903 50 0.06 70
IV.RUFI.EHE. 2023-02-12T18:46:32.29 0.3 undecidable manual P 12 58.9965 50 -0.13 70
TV.SF11.HHZ. 2023-02-12T18:46:32.23 0.6 undecidable manual P 152 56.1993 50 0.24 46
IV.CRMI.HHZ. 2023-02-12T18:46:32.99 0.3 undecidable manual P 330 61.0944 50 0.26 68
IV.CRE.HHZ. 2023-02-12T18:46:32.76 0.3 undecidable manual P 55 58.3971 50 0.44 66
IV.ARCI.HHZ. 2023-02-12T18:46:31.39 0.3 undecidable manual P 169 52.503 50 -0.03 73
IV.OSSC.HHZ. 2023-02-12T18:46:30.10 0.3 undecidable manual S 339 24.5532 109 -0.45 70
IV.CAFI.HHZ. 2023-02-12T18:46:30.64 0.1 undecidable manual P 88 49.2174 50 -0.26 93
IV.FROS.CHZ. 2023-02-12T18:46:29.40 0.3 undecidable manual S 234 20.1687 113 0.28 73
IV.TRIF.CHZ. 2023-02-12T18:46:29.99 0.3 undecidable manual P 239 43.0236 50 0.04 74
IV.MALA2.EHN. 2023-02-12T18:46:28.58 0.1 undecidable manual P 164 36.1416 50 -0.32 94
IV.MALA1.EHN. 2023-02-12T18:46:28.56 0.3 undecidable manual P 164 36.1416 50 -0.32 70
IV.CSNT.HHZ. 2023-02-12T18:46:28.00 0.3 undecidable manual S 343 18.0708 115 -0.47 70
IV.MALA4.EHZ. 2023-02-12T18:46:28.55 0.1 undecidable manual P 164 35.9418 50 -0.31 94
IV.MALA5.EHN. 2023-02-12T18:46:28.53 0.1 undecidable manual P 164 35.8419 50 -0.31 94
IV.OSSC.HHZ. 2023-02-12T18:46:26.50 0.1 undecidable manual P 339 24.5532 109 -0.25 97
IV.FROS.CHZ. 2023-02-12T18:46:26.31 0.1 positive manual P 234 20.1687 113 0.39 95
IV.CSNT.HHZ. 2023-02-12T18:46:25.38 0.1 undecidable manual P 343 18.0708 115 -0.16 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.CHE. ML:0.0 0.0010025 0.1 AML other m 2023-02-12T18:46:29.89
IV.FROS.CHN. ML:0.0 0.001745 0.2 AML other m 2023-02-12T18:46:30.11
IV.OSSC.HHE. ML:0.0 0.00040100000000000004 0.54 AML other m 2023-02-12T18:46:30.70
IV.OSSC.HHN. ML:0.0 0.00030000000000000003 1.14 AML other m 2023-02-12T18:46:30.78
IV.TRIF.CHE. ML:0.0 0.0003165 1.22 AML other m 2023-02-12T18:46:36.38
IV.TRIF.CHN. ML:0.0 0.00029949999999999996 0.76 AML other m 2023-02-12T18:46:37.17
IV.CAFI.HHE. ML:0.0 0.00010085 0.22 AML other m 2023-02-12T18:46:37.45
IV.CAFI.HHN. ML:0.0 0.00010555 1.34 AML other m 2023-02-12T18:46:38.69
IV.ARCI.HHN. ML:0.0 0.0001116 1.4 AML other m 2023-02-12T18:46:40.73
IV.ARCI.HHE. ML:0.0 0.0000999 1.02 AML other m 2023-02-12T18:46:40.57
IV.CRE.HHE. ML:0.0 0.00007645 0.76 AML other m 2023-02-12T18:46:43.82
IV.CRE.HHN. ML:0.0 0.00009195 0.26 AML other m 2023-02-12T18:46:44.58
IV.CASP.HHN. ML:0.0 0.00009275 0.64 AML other m 2023-02-12T18:46:46.15
IV.CASP.HHE. ML:0.0 0.00006670000000000001 0.32 AML other m 2023-02-12T18:46:46.25
IV.PII.HHE. ML:0.0 0.0000547 0.18 AML other m 2023-02-12T18:46:48.57
IV.PII.HHN. ML:0.0 0.00008010000000000001 0.66 AML other m 2023-02-12T18:46:48.98
IV.SEI.HHN. ML:2.1 0.000176 0.94 AML other m 2023-02-12T18:46:49.01
IV.SEI.HHE. ML:2.0 0.00013700000000000002 0.3 AML other m 2023-02-12T18:46:49.55
IV.MGAB.HHE. ML:0.0 0.00005044999999999999 0.18 AML other m 2023-02-12T18:46:49.56
IV.MGAB.HHN. ML:0.0 0.00008054999999999999 0.2 AML other m 2023-02-12T18:46:50.39
IV.PARC.HHE. ML:0.0 0.0000356 0.8 AML other m 2023-02-12T18:46:50.12
IV.PARC.HHN. ML:0.0 0.00004295 1.54 AML other m 2023-02-12T18:46:50.91
IV.LMD.HHN. ML:0.0 0.00003845 0.66 AML other m 2023-02-12T18:46:51.49
IV.ATMI.HHE. ML:1.9 0.00012595 1.46 AML other m 2023-02-12T18:46:52.06
IV.ATMI.HHN. ML:1.8 0.0001075 1.14 AML other m 2023-02-12T18:46:52.98
IV.LMD.HHE. ML:0.0 0.000028437496 0.8704 AML other m 2023-02-12T18:46:52.65
IV.BDI.HHN. ML:0.0 0.000020464999999999998 1.22 AML other m 2023-02-12T18:46:56.21
IV.BDI.HHE. ML:0.0 0.0000257 1.18 AML other m 2023-02-12T18:47:00.70
GU.POPM.HHE. ML:0.0 0.000027155040000000003 1.1776 AML other m 2023-02-12T18:46:51.61
GU.POPM.HHN. ML:0.0 0.000030303715 0.6528 AML other m 2023-02-12T18:46:51.97
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