Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.4 on date 01-10-2018 and time 00:17:31 (Italy) in region 2 km NE Montieri (GR)

A magnitude ML 0.4 earthquake occured in region: 2 km NE Montieri (GR), on

  • 30-09-2018 22:17:31 (UTC)
  • 01-10-2018 00:17:31 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.1470, 11.0320 at 10 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 2 1204 1204
Chiusdino SI 5 1903 3107
Monticiano SI 12 1571 4678
Castelnuovo di Val di Cecina PI 12 2231 6909
Radicondoli SI 13 914 7823
Monterotondo Marittimo GR 14 1371 9194
Massa Marittima GR 16 8375 17569
Roccastrada GR 19 9199 26768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SW of Siena (53903 inhabitants)
43 Km N of Grosseto (82087 inhabitants)
69 Km S of Scandicci (50609 inhabitants)
72 Km S of Firenze (382808 inhabitants)
74 Km SE of Livorno (159219 inhabitants)
78 Km W of Arezzo (99543 inhabitants)
81 Km SE of Pisa (89158 inhabitants)
82 Km S of Prato (191150 inhabitants)
88 Km S of Pistoia (90315 inhabitants)
89 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
Reviewed
Rev100 		ML 0.4 2018-09-30
22:17:31		 43.1467 11.032 10 2018-09-30
22:26:26		 Sala Sismica INGV-Roma 61489751
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-09-30 22:17:31 ± 0.17
Latitude 43.1467 ± 0.0099
Longitude 11.0320 ± 0.0123
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 61489751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1038
Semi-minor axis of confidence ellipse (meter) 995
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 355
Circular confidence region, given by single value of horizontal uncertainty (meter) 1040.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 95
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.45
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.54049
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 61489751
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-09-30 22:26:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
TV.SF13.HHZ. 2018-09-30T22:17:51.26 0.6 undecidable manual S 127 59.9955 50 0.86 49
IV.LMD.HHZ. 2018-09-30T22:17:50.79 3.0 undecidable manual P -0.47 0
IV.ARCI.HHZ. 2018-09-30T22:17:46.51 0.3 undecidable manual S 132 48.618 50 -0.86 75
IV.CASP.HHZ. 2018-09-30T22:17:45.07 0.3 undecidable manual S 199 41.7249 50 -0.46 89
TV.SF13.HHZ. 2018-09-30T22:17:43.02 0.6 undecidable manual P 127 59.9955 50 0.56 55
IV.MAGO.HHZ. 2018-09-30T22:17:42.61 0.3 undecidable manual S 295 33.3444 50 -0.68 83
IV.CASP.HHZ. 2018-09-30T22:17:40.51 0.3 undecidable manual P 199 41.7249 50 0.86 76
IV.ARCI.HHZ. 2018-09-30T22:17:40.96 0.6 undecidable manual P 132 48.618 50 0.25 61
IV.RIBO.EHZ.01 2018-09-30T22:17:39.44 0.3 undecidable manual S 177 21.9669 114 -0.5 91
IV.CSNT.HHZ. 2018-09-30T22:17:39.55 0.6 undecidable manual P 30 41.8248 50 -0.11 64
IV.MAGO.HHZ. 2018-09-30T22:17:38.72 0.3 undecidable manual P 295 33.3444 50 0.36 92
IV.RIBO.EHZ.01 2018-09-30T22:17:36.68 0.3 undecidable manual P 177 21.9669 114 0.26 96
IV.TRIF.HHZ. 2018-09-30T22:17:36.57 0.3 undecidable manual S 251 11.0778 131 -0.14 100
IV.FROS.HHZ. 2018-09-30T22:17:36.58 0.3 undecidable manual S 55 12.2766 128 -0.45 93
IV.TRIF.HHZ. 2018-09-30T22:17:35.02 0.3 undecidable manual P 251 11.0778 131 0.47 93
IV.FROS.HHZ. 2018-09-30T22:17:35.00 0.6 undecidable manual P 55 12.2766 128 0.26 65
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FROS.HHN. ML:0.5 0.000036965635 0.1792 AML other m 2018-09-30T22:17:38.85
IV.FROS.HHE. ML:0.4 0.000029839810000000003 0.2048 AML other m 2018-09-30T22:17:38.67
IV.RIBO.EHE.01 ML:0.6 0.000023074965 0.192 AML other m 2018-09-30T22:17:39.56
IV.MAGO.HHE. ML:0.4 0.0000087582315 0.0768 AML other m 2018-09-30T22:17:43.42
IV.MAGO.HHN. ML:0.4 0.000011009186500000001 0.192 AML other m 2018-09-30T22:17:43.30
IV.CASP.HHE. ML:0.5 0.000008149287999999999 0.1408 AML other m 2018-09-30T22:17:45.29
IV.ARCI.HHN. ML:0.3 0.0000032000095 0.1536 AML other m 2018-09-30T22:17:47.80
IV.ARCI.HHE. ML:0.3 0.0000051337535 0.1792 AML other m 2018-09-30T22:17:47.56
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