Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 16-05-2023 and time 08:19:02 (UTC) in region 4 km N Montieri (GR)

A magnitude ML 0.9 earthquake occured in region: 4 km N Montieri (GR), on

  • 16-05-2023 08:19:02 (UTC)
  • 16-05-2023 10:19:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1680, 11.0040 at 5 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.

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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 4 1204 1204
Chiusdino SI 7 1903 3107
Castelnuovo di Val di Cecina PI 9 2231 5338
Radicondoli SI 11 914 6252
Monterotondo Marittimo GR 12 1371 7623
Monticiano SI 15 1571 9194
Massa Marittima GR 16 8375 17569
Pomarance PI 18 5897 23466
Casole d'Elsa SI 20 3897 27363

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SW of Siena (53903 inhabitants)
46 Km N of Grosseto (82087 inhabitants)
67 Km S of Scandicci (50609 inhabitants)
70 Km SW of Firenze (382808 inhabitants)
71 Km SE of Livorno (159219 inhabitants)
78 Km SE of Pisa (89158 inhabitants)
79 Km W of Arezzo (99543 inhabitants)
80 Km S of Prato (191150 inhabitants)
86 Km SE of Lucca (89046 inhabitants)
86 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
Reviewed
Rev100 		ML 0.9 2023-05-16
08:19:02		 43.168 11.0043 5 2023-05-16
08:33:56		 Sala Sismica INGV-Roma 117401591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-05-16 08:19:02 ± 0.15
Latitude 43.1680 ± 0.0036
Longitude 11.0043 ± 0.0037
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 117401591

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 351
Semi-minor axis of confidence ellipse (meter) 295
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 141
Circular confidence region, given by single value of horizontal uncertainty (meter) 350.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 195
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.06
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.22123
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 3
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 117401591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-05-16 08:33:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.ROTM.HHZ. 2023-05-16T08:20:21.75 3.0 undecidable manual Sg 11.1 0
GU.ENR.HHZ. 2023-05-16T08:20:18.85 3.0 undecidable manual Sn -5.54 0
OT.TAR1.HHZ. 2023-05-16T08:20:14.19 3.0 undecidable manual Pg 9.8 0
IV.CMPR.HHZ. 2023-05-16T08:20:03.92 3.0 undecidable manual Pg 10.19 0
ST.GAGG.HHZ. 2023-05-16T08:20:01.24 3.0 undecidable manual Sg 6.27 0
NI.VINO.HHZ. 2023-05-16T08:19:52.40 3.0 undecidable manual Sn -4.19 0
IV.AGLI.HHZ. 2023-05-16T08:19:48.30 3.0 positive manual Pg 2.97 0
IV.PTRJ.HHZ. 2023-05-16T08:19:39.19 3.0 undecidable manual Pg 1.88 0
GU.CIRO.HHZ. 2023-05-16T08:19:38.22 3.0 positive manual Pn -8.3 0
IV.RCAV.EHZ. 2023-05-16T08:19:25.49 3.0 undecidable manual Pg 0.55 0
IV.FAGN.HHZ. 2023-05-16T08:19:23.26 3.0 positive manual Pg 1.44 0
IV.PLMA.HHZ. 2023-05-16T08:19:22.50 3.0 negative manual Pg 3.01 0
IV.RIBO.EHZ. 2023-05-16T08:19:11.14 0.6 undecidable manual S 172 24.5532 101 -0.05 65
IV.RIBO.EHZ. 2023-05-16T08:19:07.62 0.6 positive manual P 172 24.5532 101 0.09 64
IV.FROS.CHZ. 2023-05-16T08:19:07.38 0.3 undecidable manual S 69 13.0758 110 0.02 100
IV.TRIF.CHZ. 2023-05-16T08:19:06.42 0.6 undecidable manual S 234 10.1787 115 0.02 67
IV.FROS.CHZ. 2023-05-16T08:19:05.26 0.6 undecidable manual P 69 13.0758 110 -0.06 66
IV.TRIF.CHZ. 2023-05-16T08:19:04.70 1.0 undecidable manual P 234 10.1787 115 -0.06 33
IV.COR1.EHZ. 2023-05-16T08:19:03.77 3.0 undecidable manual P -0.37 0
IV.ATFO.HHZ. 2023-05-16T08:19:02.38 3.0 negative manual P -2.06 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHE. ML:1.1 0.000196423 0.1152 AML other m 2023-05-16T08:19:06.81
IV.TRIF.CHN. ML:1.1 0.00019635165 0.2496 AML other m 2023-05-16T08:19:06.92
IV.FROS.CHE. ML:0.8 0.00007316333 0.1408 AML other m 2023-05-16T08:19:07.61
IV.FROS.CHN. ML:0.8 0.00008175915 0.1536 AML other m 2023-05-16T08:19:07.56
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