Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 21-03-2023 and time 17:48:01 (Italy) in region 2 km NE Buonconvento (SI)

A magnitude ML 1.4 earthquake occured in region: 2 km NE Buonconvento (SI), on

  • 21-03-2023 16:48:01 (UTC)
  • 21-03-2023 17:48:01 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.1520, 11.4970 at 10 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
Buonconvento SI 2 3173 3173
San Giovanni d'Asso SI 8 853 4026
Murlo SI 9 2389 6415
Montalcino SI 10 5093 11508
Asciano SI 11 7118 18626
Monteroni d'Arbia SI 11 9088 27714
San Quirico d'Orcia SI 13 2662 30376
Trequanda SI 15 1254 31630
Pienza SI 17 2107 33737
Rapolano Terme SI 17 5249 38986
Castiglione d'Orcia SI 19 2346 41332

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km SE of Siena (53903 inhabitants)
47 Km SW of Arezzo (99543 inhabitants)
54 Km NE of Grosseto (82087 inhabitants)
71 Km S of Firenze (382808 inhabitants)
72 Km SE of Scandicci (50609 inhabitants)
73 Km W of Perugia (166134 inhabitants)
87 Km SE of Prato (191150 inhabitants)
96 Km NW of Viterbo (67173 inhabitants)
99 Km SE of Pistoia (90315 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 1.4 2023-03-21
16:48:01		 43.152 11.4973 10 2024-03-01
17:18:19		 Bollettino Sismico Italiano INGV 124164161
Reviewed
Rev100 		ML 1.3 2023-03-21
16:48:01		 43.1568 11.4757 10 2023-03-21
16:55:09		 Sala Sismica INGV-Roma 115595871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-03-21 16:48:01 ± 0.09
Latitude 43.1520 ± 0.0054
Longitude 11.4973 ± 0.0099
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 124164161

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 671
Semi-minor axis of confidence ellipse (meter) 616
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 117
Circular confidence region, given by single value of horizontal uncertainty (meter) 670.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 100
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.57107
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 115595871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-03-21 16:55:09

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 124164161
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-12-20 15:07:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TDS.HHZ. 2023-03-21T16:49:31.38 3.0 undecidable manual Pg 14.82 0
IV.IFIL.HHZ. 2023-03-21T16:49:29.18 3.0 negative manual Pg 11.18 0
IV.SALB.HHZ. 2023-03-21T16:49:28.34 3.0 undecidable manual Pg 13.81 0
IV.ZEN8.EHZ. 2023-03-21T16:49:16.15 3.0 undecidable manual Sn 2.18 0
OT.OT17.EHZ. 2023-03-21T16:49:04.97 3.0 positive manual Pg 13.5 0
SI.ABSI.HHZ. 2023-03-21T16:49:04.90 3.0 undecidable manual Pg 8.48 0
SL.BOJS.BHZ. 2023-03-21T16:48:56.42 3.0 positive manual Pn 0.13 0
IV.IMOL.HNZ. 2023-03-21T16:48:41.27 3.0 undecidable manual S -0.22 0
IV.MMO1.EHZ. 2023-03-21T16:48:29.96 3.0 positive manual P 3.98 0
IV.OSSC.HHZ. 2023-03-21T16:48:16.50 0.6 undecidable manual S 334 45.9207 50 -0.12 46
IV.TRIF.CHZ. 2023-03-21T16:48:16.99 0.6 undecidable manual S 265 48.3183 50 -0.27 45
IV.RIBO.EHZ. 2023-03-21T16:48:16.11 0.6 undecidable manual S 239 42.9237 50 0.29 45
IV.CSNT.HHZ. 2023-03-21T16:48:14.36 0.6 undecidable manual S 335 39.3273 50 -0.5 43
IV.CRE.HHZ. 2023-03-21T16:48:13.38 0.3 undecidable manual P 35 63.3921 50 0.37 64
IV.ARCI.HHZ. 2023-03-21T16:48:12.49 0.6 undecidable manual S 183 33.3444 50 -0.76 39
IV.FROS.CHZ. 2023-03-21T16:48:12.00 0.6 undecidable manual S 283 28.3494 50 0.08 48
IV.TRIF.CHZ. 2023-03-21T16:48:11.09 0.3 undecidable manual P 265 48.3183 50 0.41 65
IV.OSSC.HHZ. 2023-03-21T16:48:10.09 0.3 undecidable manual P 334 45.9207 50 -0.23 68
IV.RIBO.EHZ. 2023-03-21T16:48:10.20 0.3 undecidable manual P 239 42.9237 50 0.35 67
IV.SACS.HHZ. 2023-03-21T16:48:10.84 0.3 undecidable manual P 135 47.4192 50 0.3 67
IV.MALA4.EHZ. 2023-03-21T16:48:08.32 0.6 undecidable manual S 186 16.2726 122 -0.07 49
IV.ARCI.HHZ. 2023-03-21T16:48:08.30 0.1 undecidable manual P 183 33.3444 50 -0.07 96
IV.MALA0.EHZ. 2023-03-21T16:48:08.26 0.6 undecidable manual S 187 16.3725 122 -0.13 49
IV.MALA2.EHZ. 2023-03-21T16:48:08.40 0.6 undecidable manual S 185 16.5723 122 -0.05 49
IV.CSNT.HHZ. 2023-03-21T16:48:08.96 0.3 undecidable manual P 335 39.3273 50 -0.34 67
IV.MALA5.EHZ. 2023-03-21T16:48:08.19 0.6 undecidable manual S 186 16.1727 122 -0.15 49
IV.FROS.CHZ. 2023-03-21T16:48:07.82 0.1 positive manual P 283 28.3494 50 0.22 94
IV.MALA2.EHZ. 2023-03-21T16:48:05.61 0.1 undecidable manual P 185 16.5723 122 0.01 100
IV.MALA5.EHZ. 2023-03-21T16:48:05.54 0.1 undecidable manual P 186 16.1727 122 0 100
IV.MALA4.EHZ. 2023-03-21T16:48:05.58 0.1 undecidable manual P 186 16.2726 122 0.01 100
IV.MALA0.EHZ. 2023-03-21T16:48:05.60 0.1 undecidable manual P 187 16.3725 122 0.04 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MALA2.EHN. ML:1.8 0.0005574999999999999 0.22 AML other m 2023-03-21T16:48:08.61
IV.MALA2.EHE. ML:1.9 0.0007355 0.36 AML other m 2023-03-21T16:48:08.56
IV.FROS.CHN. ML:1.6 0.0001985 0.36 AML other m 2023-03-21T16:48:12.65
IV.FROS.CHE. ML:1.8 0.000297 0.34 AML other m 2023-03-21T16:48:12.76
IV.ARCI.HHE. ML:1.2 0.0000636 0.2 AML other m 2023-03-21T16:48:13.96
IV.CSNT.HHN. ML:1.2 0.0000522 0.76 AML other m 2023-03-21T16:48:14.63
IV.CSNT.HHE. ML:1.1 0.000045600000000000004 0.28 AML other m 2023-03-21T16:48:14.65
IV.ARCI.HHN. ML:1.3 0.00009075 0.3 AML other m 2023-03-21T16:48:14.87
IV.TRIF.CHN. ML:1.2 0.0000378 1.32 AML other m 2023-03-21T16:48:18.07
IV.TRIF.CHE. ML:1.3 0.0000511 0.62 AML other m 2023-03-21T16:48:18.43
IV.CRE.HHE. ML:1.2 0.0000286 1.58 AML other m 2023-03-21T16:48:24.91
IV.CRE.HHN. ML:1.3 0.00003555 0.46 AML other m 2023-03-21T16:48:25.16
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