Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 16-05-2023 and time 08:15:54 (UTC) in region 6 km NW Montieri (GR)

A magnitude ML 0.9 earthquake occured in region: 6 km NW Montieri (GR), on

  • 16-05-2023 08:15:54 (UTC)
  • 16-05-2023 10:15:54 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1830, 10.9910 at 8 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

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 6 1204 1204
Castelnuovo di Val di Cecina PI 7 2231 3435
Chiusdino SI 9 1903 5338
Radicondoli SI 10 914 6252
Monterotondo Marittimo GR 12 1371 7623
Monticiano SI 16 1571 9194
Pomarance PI 16 5897 15091
Massa Marittima GR 17 8375 23466
Casole d'Elsa SI 18 3897 27363

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km W of Siena (53903 inhabitants)
48 Km N of Grosseto (82087 inhabitants)
66 Km S of Scandicci (50609 inhabitants)
69 Km SE of Livorno (159219 inhabitants)
69 Km SW of Firenze (382808 inhabitants)
76 Km SE of Pisa (89158 inhabitants)
78 Km S of Prato (191150 inhabitants)
79 Km W of Arezzo (99543 inhabitants)
84 Km SE of Lucca (89046 inhabitants)
84 Km S of Pistoia (90315 inhabitants)
97 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
Reviewed
Rev100 		ML 0.9 2023-05-16
08:15:54		 43.1827 10.9907 8 2023-05-16
08:32:24		 Sala Sismica INGV-Roma 117401541
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-05-16 08:15:54 ± 0.07
Latitude 43.1827 ± 0.0036
Longitude 10.9907 ± 0.0049
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 117401541

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 365
Semi-minor axis of confidence ellipse (meter) 323
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 147
Circular confidence region, given by single value of horizontal uncertainty (meter) 370.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 165
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.09
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.38761
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 4
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 117401541
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-05-16 08:32:24
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
AC.SRN.HHZ. 2023-05-16T08:17:36.57 3.0 undecidable manual Pn -5.89 0
IV.MFNL.HHZ. 2023-05-16T08:17:36.94 3.0 undecidable manual Pg 20.860001 0
IV.PTCC.HHZ. 2023-05-16T08:17:25.57 3.0 undecidable manual Sg 7.5 0
IV.SPS2.HHZ. 2023-05-16T08:17:13.83 3.0 negative manual Pn -3.12 0
IV.FAGN.HHZ. 2023-05-16T08:17:11.01 3.0 undecidable manual Sg 6.41 0
IV.RCAV.EHZ. 2023-05-16T08:17:01.87 3.0 undecidable manual Sg -0.34 0
IV.MF5.EHZ. 2023-05-16T08:16:54.72 3.0 undecidable manual Sn 0.2 0
ST.GAGG.HHZ. 2023-05-16T08:16:53.45 3.0 undecidable manual Sg 0.9 0
IV.MRB1.HHZ. 2023-05-16T08:16:43.19 3.0 undecidable manual Pn -5.97 0
IV.MGAB.HHZ. 2023-05-16T08:16:38.05 3.0 undecidable manual Sg 4.32 0
IV.GIUL.HHZ. 2023-05-16T08:16:36.46 3.0 positive manual Pg 4.38 0
IV.CRE.HHZ. 2023-05-16T08:16:25.80 3.0 undecidable manual Sg 1.32 0
GU.CANO.HHZ. 2023-05-16T08:16:11.77 3.0 undecidable manual Pg 0.73 0
IV.RIBO.EHZ. 2023-05-16T08:16:04.05 0.6 undecidable manual S 170 26.3514 107 -0.05 65
IV.OSSC.HHE. 2023-05-16T08:16:02.95 0.6 undecidable manual P 28 43.0236 50 -0.08 63
IV.RIBO.EHZ. 2023-05-16T08:16:00.14 0.6 negative manual P 170 26.3514 107 0.07 65
IV.FROS.CHZ. 2023-05-16T08:16:00.03 0.3 undecidable manual S 77 13.6752 120 -0.03 100
IV.TRIF.CHZ. 2023-05-16T08:15:58.96 0.6 undecidable manual S 223 10.3785 127 -0.13 66
IV.TRIF.CHZ. 2023-05-16T08:15:57.28 0.3 negative manual P 223 10.3785 127 0.1 99
IV.FROS.CHZ. 2023-05-16T08:15:57.78 0.3 undecidable manual P 77 13.6752 120 0.04 100
IV.PLMA.HHZ. 2023-05-16T08:15:49.45 3.0 undecidable manual P -2.06 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHE. ML:0.9 0.00010760399000000001 0.1664 AML other m 2023-05-16T08:15:59.35
IV.TRIF.CHN. ML:1.0 0.00012350595000000002 0.2432 AML other m 2023-05-16T08:15:59.58
IV.FROS.CHE. ML:0.6 0.000038621875 0.128 AML other m 2023-05-16T08:16:00.09
IV.FROS.CHN. ML:0.7 0.000055524135 1.1968 AML other m 2023-05-16T08:16:00.11
IV.RIBO.EHN.01 ML:1.4 0.00015273365 3.104 AML other m 2023-05-16T08:16:06.05
IV.RIBO.EHE.01 ML:1.0 0.000067184445 2.08 AML other m 2023-05-16T08:16:03.64
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