Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 20-04-2023 and time 08:16:01 (Italy) in region 2 km SE Montieri (GR)

A magnitude ML 1.7 earthquake occured in region: 2 km SE Montieri (GR), on

  • 20-04-2023 06:16:01 (UTC)
  • 20-04-2023 08:16:01 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1200, 11.0330 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
Montieri GR 2 1204 1204
Chiusdino SI 6 1903 3107
Monticiano SI 12 1571 4678
Massa Marittima GR 14 8375 13053
Castelnuovo di Val di Cecina PI 14 2231 15284
Monterotondo Marittimo GR 15 1371 16655
Radicondoli SI 16 914 17569
Roccastrada GR 16 9199 26768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km SW of Siena (53903 inhabitants)
41 Km N of Grosseto (82087 inhabitants)
72 Km S of Scandicci (50609 inhabitants)
75 Km S of Firenze (382808 inhabitants)
76 Km SE of Livorno (159219 inhabitants)
79 Km W of Arezzo (99543 inhabitants)
84 Km SE of Pisa (89158 inhabitants)
85 Km S of Prato (191150 inhabitants)
91 Km S of Pistoia (90315 inhabitants)
91 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 2023-04-20
06:16:01		 43.1203 11.0327 10 2024-03-01
17:18:07		 Bollettino Sismico Italiano INGV 117250741
Reviewed
Rev100 		ML 1.7 2023-04-20
06:16:01		 43.1178 11.0403 11 2023-04-20
06:41:59		 Sala Sismica INGV-Roma 116539861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-20 06:16:01 ± 0.1
Latitude 43.1203 ± 0.0054
Longitude 11.0327 ± 0.0111
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 117250741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 877
Semi-minor axis of confidence ellipse (meter) 500
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) 880.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
Number of associated phases, regardless of their use for origin computation 44
Number of defining phases 44
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.09533
Epicentral distance of station farthest from the epicenter (degree) 1.03332
Number of stations at which the event was observed 29
Number of stations from which data was used for origin computation 29
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.4
Num. used stations 44
Type of magnitude ML
Reference to an origin 117250741
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-01-26 13:53:48

ML:1.7

Field Value
Value 1.7
Uncertainty 0.4
Num. used stations 46
Type of magnitude ML
Reference to an origin 116539861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-20 06:41:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RUFI.EHZ. 2023-04-20T06:16:27.98 0.6 undecidable manual S 26 88.3449 50 0.2 43
IV.PII.HHN. 2023-04-20T06:16:24.89 0.6 undecidable manual S 329 78.2661 50 -0.19 44
IV.CRMI.HHZ. 2023-04-20T06:16:23.59 0.6 undecidable manual S 357 75.0693 50 -0.62 39
IV.ATVO.HHZ. 2023-04-20T06:16:21.79 0.6 undecidable manual P 75 114.6963 50 1.04 30
IV.PARC.HHZ. 2023-04-20T06:16:21.42 0.3 undecidable manual P 59 113.4975 50 0.86 49
TV.SF11.HHZ. 2023-04-20T06:16:20.73 0.6 undecidable manual S 118 59.3961 50 0.68 39
IV.BDI.HHZ. 2023-04-20T06:16:20.36 0.6 undecidable manual P 342 110.3118 50 0.3 40
IV.VMGN.HHZ. 2023-04-20T06:16:19.36 0.6 undecidable manual P 23 100.9212 50 0.74 35
GU.POPM.HHZ. 2023-04-20T06:16:19.54 0.6 undecidable manual P 348 104.9172 50 0.3 40
IV.BOSL.HHZ. 2023-04-20T06:16:18.18 0.6 undecidable manual P 17 94.0392 50 0.62 38
GU.MAIM.HHZ. 2023-04-20T06:16:18.28 0.3 undecidable manual P 334 98.124 50 0.09 64
IV.MPPT.EHZ. 2023-04-20T06:16:17.54 0.6 undecidable manual P 3 92.9403 50 0.14 43
IV.MGAB.HHZ. 2023-04-20T06:16:17.69 0.6 undecidable manual P 104 90.5427 50 0.67 37
IV.CRE.HHZ. 2023-04-20T06:16:17.80 1.0 undecidable manual P 53 92.4408 50 0.48 20
IV.ARCI.HNZ. 2023-04-20T06:16:16.14 0.6 undecidable manual S 130 46.62 50 -0.5 43
IV.OSSC.HHZ. 2023-04-20T06:16:16.20 0.6 undecidable manual S 21 47.9187 50 -0.78 39
IV.LATE.HHZ. 2023-04-20T06:16:16.86 0.6 undecidable manual P 132 84.249 50 0.81 35
IV.RUFI.EHZ. 2023-04-20T06:16:16.92 0.3 undecidable manual P 26 88.3449 50 0.23 63
IV.SACS.HHZ. 2023-04-20T06:16:15.68 0.6 undecidable manual P 113 77.2671 50 0.7 38
IV.CAFI.HHZ. 2023-04-20T06:16:15.45 0.3 undecidable manual P 73 78.9654 50 0.22 65
IV.PII.HHN. 2023-04-20T06:16:15.70 0.6 undecidable manual P 329 78.2661 50 0.57 40
IV.CASP.HHZ. 2023-04-20T06:16:14.33 0.6 undecidable manual S 200 39.0276 50 -0.27 46
IV.CRMI.HHZ. 2023-04-20T06:16:14.52 0.3 undecidable manual P 357 75.0693 50 -0.11 67
IV.CSNT.HHZ. 2023-04-20T06:16:14.95 0.6 undecidable manual S 28 44.3223 50 -1.07 34
IV.MALA1.EHN. 2023-04-20T06:16:13.95 0.6 undecidable manual S 110 38.2284 50 -0.45 44
IV.MALA4.EHN. 2023-04-20T06:16:13.70 0.6 undecidable manual S 109 38.2284 50 -0.7 41
IV.MALA0.EHN. 2023-04-20T06:16:13.66 0.3 undecidable manual S 109 37.9287 50 -0.66 62
IV.MALA2.EHZ. 2023-04-20T06:16:13.74 0.6 undecidable manual S 110 38.3283 50 -0.69 41
IV.MCIV.CHZ. 2023-04-20T06:16:13.47 0.1 undecidable manual P 126 64.5909 50 0.45 84
IV.MALA5.EHN. 2023-04-20T06:16:13.72 0.6 undecidable manual S 109 38.2284 50 -0.67 41
TV.SF11.HHZ. 2023-04-20T06:16:12.63 0.3 undecidable manual P 118 59.3961 50 0.41 65
IV.ARCI.HNZ. 2023-04-20T06:16:10.49 0.1 undecidable manual P 130 46.62 50 0.23 92
IV.OSSC.HHZ. 2023-04-20T06:16:10.19 0.1 undecidable manual P 21 47.9187 50 -0.26 91
IV.CASP.HHZ. 2023-04-20T06:16:09.29 0.1 undecidable manual P 200 39.0276 50 0.21 93
IV.CSNT.HHZ. 2023-04-20T06:16:09.58 0.1 undecidable manual P 28 44.3223 50 -0.31 90
IV.MALA5.EHN. 2023-04-20T06:16:08.86 0.1 undecidable manual P 109 38.2284 50 -0.1 96
IV.MALA4.EHN. 2023-04-20T06:16:08.86 0.1 undecidable manual P 109 38.2284 50 -0.1 95
IV.MALA2.EHZ. 2023-04-20T06:16:08.90 0.1 undecidable manual P 110 38.3283 50 -0.08 96
IV.MALA1.EHN. 2023-04-20T06:16:08.87 0.3 undecidable manual P 110 38.2284 50 -0.09 72
IV.RIBO.EHZ.01 2023-04-20T06:16:08.76 0.3 undecidable manual S 177 19.0698 118 -0.27 72
IV.MALA0.EHN. 2023-04-20T06:16:08.84 0.1 undecidable manual P 109 37.9287 50 -0.07 96
IV.RIBO.EHZ.01 2023-04-20T06:16:06.04 0.3 undecidable manual P 177 19.0698 118 0.18 73
IV.TRIF.CHZ. 2023-04-20T06:16:05.90 0.3 undecidable manual S 267 10.5783 134 -0.73 63
IV.TRIF.CHZ. 2023-04-20T06:16:04.36 0.1 undecidable manual P 267 10.5783 134 -0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHE. ML:2.8 0.008955 0.56 AML other m 2023-04-20T06:16:06.49
IV.TRIF.CHN. ML:2.6 0.00584 1.6 AML other m 2023-04-20T06:16:06.90
IV.RIBO.EHN.01 ML:2.8 0.005195 0.44 AML other m 2023-04-20T06:16:09.45
IV.RIBO.EHE.01 ML:2.8 0.004645 0.5 AML other m 2023-04-20T06:16:09.15
IV.CASP.HNN. ML:2.7 0.0019950000000000002 0.22 AML other m 2023-04-20T06:16:14.53
IV.CASP.HHE. ML:2.6 0.00127 0.36 AML other m 2023-04-20T06:16:14.70
IV.CASP.HHN. ML:2.8 0.0020350000000000004 0.2 AML other m 2023-04-20T06:16:14.75
IV.CASP.HNE. ML:2.6 0.001375 0.38 AML other m 2023-04-20T06:16:14.65
IV.CSNT.HHN. ML:2.2 0.000484 0.2 AML other m 2023-04-20T06:16:15.17
IV.CSNT.HHE. ML:2.0 0.00033999999999999997 0.24 AML other m 2023-04-20T06:16:15.54
IV.OSSC.HHN. ML:1.8 0.0001595 0.24 AML other m 2023-04-20T06:16:16.91
IV.OSSC.HHE. ML:2.0 0.0002455 1.1 AML other m 2023-04-20T06:16:16.32
TV.SF11.HHE. ML:2.4 0.00048249999999999996 1.24 AML other m 2023-04-20T06:16:21.90
IV.MCIV.CHN. ML:1.9 0.00014050000000000003 0.18 AML other m 2023-04-20T06:16:23.59
IV.MCIV.CHE. ML:2.0 0.000186 1.68 AML other m 2023-04-20T06:16:23.85
TV.SF11.HHN. ML:2.1 0.00023999999999999998 0.38 AML other m 2023-04-20T06:16:24.72
IV.CRMI.HHN. ML:1.4 0.000037 1.52 AML other m 2023-04-20T06:16:25.19
IV.CRMI.HHE. ML:1.4 0.000040300000000000004 1.1 AML other m 2023-04-20T06:16:25.69
IV.CAFI.HHE. ML:1.2 0.0000264 0.7 AML other m 2023-04-20T06:16:29.43
IV.MPPT.EHE. ML:1.4 0.0000299 0.62 AML other m 2023-04-20T06:16:30.37
IV.BOSL.HHE. ML:1.3 0.0000223 1.34 AML other m 2023-04-20T06:16:30.67
IV.BOSL.HHN. ML:1.3 0.000022 0.16 AML other m 2023-04-20T06:16:31.24
GU.MAIM.HHN. ML:1.6 0.000039349999999999994 0.34 AML other m 2023-04-20T06:16:31.42
GU.MAIM.HHE. ML:1.5 0.000029699999999999997 1.02 AML other m 2023-04-20T06:16:31.15
IV.MPPT.EHN. ML:1.5 0.0000356 0.42 AML other m 2023-04-20T06:16:31.75
IV.LATE.HHE. ML:1.7 0.0000606 0.42 AML other m 2023-04-20T06:16:32.27
IV.ARRO.EHN. ML:1.7 0.000027450000000000003 0.08 AML other m 2023-04-20T06:16:32.98
IV.LATE.HHN. ML:1.9 0.000106 0.4 AML other m 2023-04-20T06:16:33.24
IV.CAFI.HHN. ML:1.2 0.000023899999999999998 1.04 AML other m 2023-04-20T06:16:33.26
IV.ARRO.EHE. ML:1.7 0.00002465 0.96 AML other m 2023-04-20T06:16:33.93
IV.MGAB.HHE. ML:1.4 0.00002925 1.6 AML other m 2023-04-20T06:16:34.91
IV.CRE.HHN. ML:1.7 0.00006155 0.36 AML other m 2023-04-20T06:16:34.21
IV.CRE.HHE. ML:1.8 0.00006365 0.3 AML other m 2023-04-20T06:16:34.53
IV.MGAB.HHN. ML:1.4 0.00002885 0.28 AML other m 2023-04-20T06:16:34.85
GU.POPM.HHE. ML:1.8 0.000059250000000000004 0.28 AML other m 2023-04-20T06:16:34.73
IV.BDI.HHN. ML:1.6 0.000033799999999999995 1.16 AML other m 2023-04-20T06:16:34.95
GU.POPM.HHN. ML:1.8 0.0000584 0.62 AML other m 2023-04-20T06:16:35.55
IV.VMGN.HHE. ML:1.4 0.00002425 0.58 AML other m 2023-04-20T06:16:35.44
IV.VMGN.HHN. ML:1.6 0.00003715 1.26 AML other m 2023-04-20T06:16:38.90
IV.BDI.HHE. ML:1.6 0.000031100000000000004 0.36 AML other m 2023-04-20T06:16:40.55
IV.PARC.HHN. ML:1.4 0.000020150000000000002 1.44 AML other m 2023-04-20T06:16:41.89
IV.ATVO.HHE. ML:1.4 0.00001765 1.28 AML other m 2023-04-20T06:16:41.07
IV.PARC.HHE. ML:1.4 0.000019450000000000002 0.56 AML other m 2023-04-20T06:16:43.57
IV.ATVO.HHN. ML:1.4 0.00001935 0.68 AML other m 2023-04-20T06:16:43.29
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