Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 01-04-2023 and time 10:46:52 (UTC) in region 5 km SE Monterotondo Marittimo (GR)

A magnitude ML 1.7 earthquake occured in region: 5 km SE Monterotondo Marittimo (GR), on

  • 01-04-2023 10:46:52 (UTC)
  • 01-04-2023 12:46:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1200, 10.9120 at 9 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
Monterotondo Marittimo GR 5 1371 1371
Massa Marittima GR 8 8375 9746
Montieri GR 9 1204 10950
Castelnuovo di Val di Cecina PI 10 2231 13181
Chiusdino SI 15 1903 15084
Monteverdi Marittimo PI 17 758 15842
Radicondoli SI 19 914 16756
Suvereto LI 19 3072 19828

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km SW of Siena (53903 inhabitants)
43 Km NW of Grosseto (82087 inhabitants)
69 Km SE of Livorno (159219 inhabitants)
74 Km SW of Scandicci (50609 inhabitants)
78 Km SW of Firenze (382808 inhabitants)
78 Km SE of Pisa (89158 inhabitants)
86 Km S of Prato (191150 inhabitants)
87 Km SE of Lucca (89046 inhabitants)
88 Km W of Arezzo (99543 inhabitants)
91 Km S of Pistoia (90315 inhabitants)
99 Km SE of Viareggio (62467 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 2023-04-01
10:46:52		 43.1197 10.9123 9 2024-03-01
17:18:03		 Bollettino Sismico Italiano INGV 116376901
Reviewed
Rev100 		ML 2.0 2023-04-01
10:46:52		 43.114 10.9253 9 2023-04-01
11:11:17		 Sala Sismica INGV-Roma 115942661
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-01 10:46:52 ± 0.11
Latitude 43.1197 ± 0.0054
Longitude 10.9123 ± 0.0086
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 116376901

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 702
Semi-minor axis of confidence ellipse (meter) 558
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 293
Circular confidence region, given by single value of horizontal uncertainty (meter) 700.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 132
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 27
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) 0.00809
Epicentral distance of station farthest from the epicenter (degree) 1.05850
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 5
Type of magnitude ML
Reference to an origin 115942661
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-01 11:11:17

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 15
Type of magnitude ML
Reference to an origin 116376901
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-05-10 14:09:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CELB.HHZ. 2023-04-01T10:47:13.73 0.6 undecidable manual S 234 70.374 50 -0.17 43
IV.FNVD.HHZ. 2023-04-01T10:47:11.30 0.3 undecidable manual P 8 117.4935 50 -0.69 51
IV.ARCI.HHZ. 2023-04-01T10:47:09.43 0.3 undecidable manual S 123 54.501 50 -0.22 65
IV.OSSC.HHE. 2023-04-01T10:47:08.77 0.6 undecidable manual S 31 52.3032 50 -0.29 43
IV.MALA2.EHN. 2023-04-01T10:47:07.61 0.6 undecidable manual S 105 47.619 50 -0.21 44
IV.MALA0.EHN. 2023-04-01T10:47:07.50 0.6 undecidable manual S 105 47.2194 50 -0.21 44
IV.MALA5.EHN. 2023-04-01T10:47:07.37 0.6 undecidable manual S 105 47.5191 50 -0.41 42
IV.MALA4.EHZ. 2023-04-01T10:47:07.60 0.6 undecidable manual S 105 47.5191 50 -0.19 44
IV.CSNT.HHZ. 2023-04-01T10:47:07.85 0.3 undecidable manual S 38 49.7169 50 -0.51 62
IV.MALA1.EHN. 2023-04-01T10:47:07.55 0.6 undecidable manual S 105 47.5191 50 -0.24 44
IV.CELB.HHZ. 2023-04-01T10:47:05.50 0.6 undecidable manual P 234 70.374 50 0.77 36
IV.CASP.HHZ. 2023-04-01T10:47:04.27 0.3 undecidable manual S 186 36.6411 50 -0.62 61
IV.ARCI.HHZ. 2023-04-01T10:47:02.78 0.3 undecidable manual P 123 54.501 50 0.5 61
IV.OSSC.HHE. 2023-04-01T10:47:02.24 0.6 undecidable manual P 31 52.3032 50 0.3 43
IV.CSNT.HHZ. 2023-04-01T10:47:01.84 0.3 undecidable manual P 38 49.7169 50 0.3 65
IV.MALA1.EHN. 2023-04-01T10:47:01.57 0.3 undecidable manual P 105 47.5191 50 0.37 64
IV.MALA2.EHN. 2023-04-01T10:47:01.59 0.3 undecidable manual P 105 47.619 50 0.37 64
IV.MALA0.EHN. 2023-04-01T10:47:01.54 0.3 undecidable manual P 105 47.2194 50 0.38 64
IV.MALA5.EHN. 2023-04-01T10:47:01.56 0.3 undecidable manual P 105 47.5191 50 0.36 64
IV.MALA4.EHZ. 2023-04-01T10:47:01.60 0.3 undecidable manual P 105 47.5191 50 0.4 64
IV.FROS.CHZ. 2023-04-01T10:47:00.39 0.3 undecidable manual S 63 22.1556 112 -0.12 71
IV.RIBO.EHZ. 2023-04-01T10:47:00.22 0.1 undecidable manual S 150 21.867 113 -0.2 93
IV.CASP.HHZ. 2023-04-01T10:46:59.56 0.3 undecidable manual P 186 36.6411 50 0.03 70
IV.RIBO.EHZ. 2023-04-01T10:46:57.18 0.3 undecidable manual P 150 21.867 113 0.23 69
IV.FROS.CHZ. 2023-04-01T10:46:57.36 0.3 undecidable manual P 63 22.1556 112 0.36 67
IV.TRIF.CHZ. 2023-04-01T10:46:54.04 0.1 undecidable manual P 236 0.8991 174 0 100
IV.TRIF.CHZ. 2023-04-01T10:46:54.89 0.3 undecidable manual S 236 0.8991 174 -0.5 68
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RIBO.EHE. ML:1.5 0.00023299012500000002 0.1408 AML other m 2023-04-01T10:47:00.52
IV.FROS.CHN. ML:2.2 0.00104063885 0.1984 AML other m 2023-04-01T10:47:00.68
IV.FROS.CHE. ML:2.0 0.0007047132499999999 0.128 AML other m 2023-04-01T10:47:01.13
IV.RIBO.EHN.01 ML:2.0 0.0006507675 0.1216 AML other m 2023-04-01T10:47:01.63
IV.CASP.HNN. ML:1.7 0.00019877195 8.416 AML other m 2023-04-01T10:47:07.45
IV.CASP.HHN. ML:1.3 0.00007864952 0.0768 AML other m 2023-04-01T10:47:04.75
IV.CASP.HHE. ML:1.3 0.000084050015 0.736 AML other m 2023-04-01T10:47:04.44
IV.CSNT.HHN. ML:1.3 0.000050051655 0.1984 AML other m 2023-04-01T10:47:08.12
IV.CSNT.HHE. ML:1.3 0.000052612165 0.2624 AML other m 2023-04-01T10:47:08.42
IV.ARCI.HNN. ML:1.7 0.00011051896999999999 0.1984 AML other m 2023-04-01T10:47:09.60
IV.ARCI.HHN. ML:1.7 0.00010986828999999999 0.1792 AML other m 2023-04-01T10:47:09.59
IV.ARCI.HHE. ML:1.6 0.000087042565 0.1856 AML other m 2023-04-01T10:47:10.37
IV.ARCI.HNE. ML:1.6 0.000082906945 0.1792 AML other m 2023-04-01T10:47:10.37
IV.CELB.HHN. ML:2.2 0.000255 0.2 AML other m 2023-04-01T10:47:14.32
IV.CELB.HHE. ML:2.1 0.000202 0.5 AML other m 2023-04-01T10:47:19.33
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
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