Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 01-04-2023 and time 10:53:10 (UTC) in region 6 km SE Monterotondo Marittimo (GR)

A magnitude ML 1.2 earthquake occured in region: 6 km SE Monterotondo Marittimo (GR), on

  • 01-04-2023 10:53:10 (UTC)
  • 01-04-2023 12:53:10 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1130, 10.9140 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
Monterotondo Marittimo GR 6 1371 1371
Massa Marittima GR 7 8375 9746
Montieri GR 9 1204 10950
Castelnuovo di Val di Cecina PI 11 2231 13181
Chiusdino SI 15 1903 15084
Monteverdi Marittimo PI 18 758 15842
Suvereto LI 19 3072 18914
Radicondoli SI 20 914 19828

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km SW of Siena (53903 inhabitants)
42 Km NW of Grosseto (82087 inhabitants)
69 Km SE of Livorno (159219 inhabitants)
75 Km SW of Scandicci (50609 inhabitants)
78 Km SW of Firenze (382808 inhabitants)
79 Km SE of Pisa (89158 inhabitants)
87 Km S of Prato (191150 inhabitants)
88 Km W of Arezzo (99543 inhabitants)
88 Km SE of Lucca (89046 inhabitants)
91 Km S of Pistoia (90315 inhabitants)
100 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 1.2 2023-04-01
10:53:10		 43.1127 10.9145 9 2024-03-01
17:18:04		 Bollettino Sismico Italiano INGV 116601861
Reviewed
Rev100 		ML 1.1 2023-04-01
10:53:10		 43.1208 10.9032 9 2023-04-01
11:08:45		 Sala Sismica INGV-Roma 115942531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-01 10:53:10 ± 0.19
Latitude 43.1127 ± 0.0081
Longitude 10.9145 ± 0.0148
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 116601861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1231
Semi-minor axis of confidence ellipse (meter) 830
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 296
Circular confidence region, given by single value of horizontal uncertainty (meter) 1230.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 114
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 6.42116
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.5
Num. used stations 4
Type of magnitude ML
Reference to an origin 115942531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-01 11:08:45

ML:1.2

Field Value
Value 1.2
Uncertainty 0.4
Num. used stations 2
Type of magnitude ML
Reference to an origin 116601861
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2023-04-22 09:08:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MSRU.HHZ. 2023-04-01T10:54:56.96 3.0 positive manual P 662.337 1.663 0
IV.CFMN.HNZ. 2023-04-01T10:54:55.17 3.0 undecidable manual Sg 7.51 0
TV.GMB1.HHZ. 2023-04-01T10:54:47.65 3.0 positive manual P 686.091 4.36 0
1J.FX14.HHZ.00 2023-04-01T10:54:43.73 3.0 positive manual P 712.7532 -2.88 0
IV.CAR1.HHZ. 2023-04-01T10:54:36.12 3.0 undecidable manual P 615.5172 1.62 0
ST.PANI.EHZ. 2023-04-01T10:54:36.64 3.0 undecidable manual Sg 4.56 0
IV.LRP.EHZ. 2023-04-01T10:54:27.01 3.0 undecidable manual Sg -0.26 0
IV.MTMR.HNZ. 2023-04-01T10:54:07.15 3.0 negative manual P 415.6728 -2.48 0
IV.INTR.HHZ. 2023-04-01T10:53:58.81 3.0 positive manual P 273.1155 6.91 0
IV.AGLI.HHZ. 2023-04-01T10:53:51.01 3.0 undecidable manual P 262.737 0.4 0
IV.ARCI.HHZ. 2023-04-01T10:53:27.90 0.3 undecidable manual S 122 53.9016 50 -0.41 63
IV.CSNT.HHZ. 2023-04-01T10:53:26.50 0.6 undecidable manual S 37 50.2164 50 -0.81 37
IV.MALA1.EHN. 2023-04-01T10:53:26.40 0.3 undecidable manual S 105 47.1195 50 -0.1 68
IV.MALA2.EHN. 2023-04-01T10:53:26.10 0.3 undecidable manual S 105 47.2194 50 -0.43 64
IV.MALA5.EHN. 2023-04-01T10:53:25.80 0.3 undecidable manual S 104 47.1195 50 -0.7 58
IV.MCIV.CHE. 2023-04-01T10:53:24.42 0.6 undecidable manual P 121 72.1722 50 0.68 37
TV.SF11.HHZ. 2023-04-01T10:53:23.57 0.6 undecidable manual P 113 67.6767 50 0.51 40
IV.CASP.HHZ. 2023-04-01T10:53:22.80 0.3 undecidable manual S 186 35.9418 50 -0.7 59
IV.ARCI.HHZ. 2023-04-01T10:53:21.37 0.1 undecidable manual P 122 53.9016 50 0.43 84
IV.MALA2.EHN. 2023-04-01T10:53:20.16 0.1 undecidable manual P 105 47.2194 50 0.24 89
IV.CSNT.HHZ. 2023-04-01T10:53:20.47 0.6 undecidable manual P 37 50.2164 50 0.1 45
IV.MALA1.EHN. 2023-04-01T10:53:20.32 0.6 undecidable manual P 105 47.1195 50 0.42 43
IV.MALA4.EHZ. 2023-04-01T10:53:20.15 0.1 undecidable manual P 104 47.2194 50 0.25 89
IV.MALA5.EHN. 2023-04-01T10:53:20.48 0.1 undecidable manual P 104 47.1195 50 0.58 81
IV.FROS.CHZ. 2023-04-01T10:53:18.90 0.3 undecidable manual S 61 22.3554 111 -0.27 69
IV.RIBO.EHZ. 2023-04-01T10:53:18.70 0.3 undecidable manual S 149 21.0678 112 -0.07 72
IV.CASP.HHZ. 2023-04-01T10:53:18.13 0.3 undecidable manual P 186 35.9418 50 -0.04 71
IV.RIBO.EHZ. 2023-04-01T10:53:15.70 0.1 undecidable manual P 149 21.0678 112 0.26 92
IV.FROS.CHZ. 2023-04-01T10:53:15.88 0.1 undecidable manual P 61 22.3554 111 0.21 93
IV.TRIF.CHZ. 2023-04-01T10:53:13.30 0.3 undecidable manual S 283 0.999 173 -0.55 67
IV.TRIF.CHZ. 2023-04-01T10:53:12.55 0.1 undecidable manual P 283 0.999 173 -0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHE. ML:0.0 0.0014760175 0.0896 AML other m 2023-04-01T10:53:13.52
IV.TRIF.CHN. ML:0.0 0.002425998 0.1088 AML other m 2023-04-01T10:53:13.54
IV.RIBO.EHE. ML:0.9 0.0000536052845 0.1216 AML other m 2023-04-01T10:53:19.09
IV.RIBO.EHN.01 ML:1.5 0.0002252034 0.0576 AML other m 2023-04-01T10:53:19.49
IV.RIBO.EHE.01 ML:0.0 0.0000536052845 0.1216 AML other m 2023-04-01T10:53:19.09
IV.RIBO.EHN. ML:0.0 0.0002252034 0.0576 AML other m 2023-04-01T10:53:19.49
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