Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 06-12-2018 and time 17:59:03 (Italy) in region 2 km E Montieri (GR)

A magnitude ML 1.6 earthquake occured in region: 2 km E Montieri (GR), on

  • 06-12-2018 16:59:03 (UTC)
  • 06-12-2018 17:59:03 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.1300, 11.0420 at 11 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.

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 2 1204 1204
Chiusdino SI 5 1903 3107
Monticiano SI 11 1571 4678
Castelnuovo di Val di Cecina PI 14 2231 6909
Radicondoli SI 15 914 7823
Monterotondo Marittimo GR 15 1371 9194
Massa Marittima GR 15 8375 17569
Roccastrada GR 17 9199 26768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SW of Siena (53903 inhabitants)
41 Km N of Grosseto (82087 inhabitants)
71 Km S of Scandicci (50609 inhabitants)
73 Km S of Firenze (382808 inhabitants)
76 Km SE of Livorno (159219 inhabitants)
78 Km W of Arezzo (99543 inhabitants)
83 Km SE of Pisa (89158 inhabitants)
84 Km S of Prato (191150 inhabitants)
90 Km S of Pistoia (90315 inhabitants)
91 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
Bulletin
Rev1000 		ML 1.6 2018-12-06
16:59:03		 43.1302 11.0425 11 2019-06-04
09:16:19		 Bollettino Sismico Italiano INGV 69048741
Reviewed
Rev100 		ML 1.6 2018-12-06
16:59:02		 43.129 11.0383 12 2018-12-06
17:09:04		 Sala Sismica INGV-Roma 63713711
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-12-06 16:59:03 ± 0.3
Latitude 43.1302 ± 0.0117
Longitude 11.0425 ± 0.0234
Depth (km) 11 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 69048741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1696
Semi-minor axis of confidence ellipse (meter) 1221
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 268
Circular confidence region, given by single value of horizontal uncertainty (meter) 1700.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 187
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.44
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.70417
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations 9
Type of magnitude ML
Reference to an origin 63713711
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-12-06 17:09:04

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations 9
Type of magnitude ML
Reference to an origin 69048741
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-05-31 10:02:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MTGR.HHZ. 2018-12-06T17:00:35.15 3.0 undecidable manual Pg 12.56 0
IV.IACL.HHZ. 2018-12-06T17:00:33.04 3.0 positive manual Pg 12.48 0
IV.SPS2.HHZ. 2018-12-06T17:00:32.71 3.0 negative manual Pn 7.62 0
IV.TDS.HHZ. 2018-12-06T17:00:32.11 3.0 undecidable manual Pg 10.49 0
IV.AGLI.HHZ. 2018-12-06T17:00:16.74 3.0 undecidable manual Sn 4.53 0
IV.IMI.HHZ. 2018-12-06T17:00:16.40 3.0 undecidable manual Sn -0.13 0
GU.RRL.HHZ. 2018-12-06T17:00:06.58 3.0 undecidable manual Pn 5.54 0
IV.VIVA.HHZ. 2018-12-06T17:00:02.77 3.0 undecidable manual Sg 4.75 0
NI.VINO.HHZ. 2018-12-06T17:00:01.37 3.0 negative manual Pn 0.68 0
IV.ZONE.HHZ. 2018-12-06T16:59:55.42 3.0 undecidable manual Pg 5.17 0
IV.COLB.HHZ. 2018-12-06T16:59:54.44 3.0 undecidable manual Pn 0.54 0
IV.EUCT.HNZ. 2018-12-06T16:59:47.41 3.0 positive manual Pn 0.46 0
IV.MNTV.HNZ. 2018-12-06T16:59:40.38 3.0 undecidable manual Pg -0.43 0
IV.SEI.HHZ. 2018-12-06T16:59:36.50 3.0 undecidable manual S -5.73 0
IV.ASSB.HHZ. 2018-12-06T16:59:24.27 3.0 undecidable manual P -2.42 0
TV.SF04.EHZ. 2018-12-06T16:59:20.95 0.6 undecidable manual S 123 59.8956 50 -0.59 42
TV.SF01.EHZ. 2018-12-06T16:59:19.63 0.6 undecidable manual S 130 55.1004 50 -0.64 41
IV.ARCI.HHZ. 2018-12-06T16:59:17.55 0.6 undecidable manual S 131 46.7199 50 -0.5 44
IV.MAON.HHZ. 2018-12-06T16:59:17.48 0.1 undecidable manual P 175 78.1662 50 0.94 70
IV.CSNT.HHZ. 2018-12-06T16:59:16.29 0.6 undecidable manual S 28 43.0236 50 -0.75 41
IV.CASP.HHZ. 2018-12-06T16:59:15.67 0.6 undecidable manual S 201 40.3263 50 -0.65 42
TV.SF14.HHN. 2018-12-06T16:59:14.15 0.1 undecidable manual P 132 62.3931 50 0.05 95
TV.SF04.EHZ. 2018-12-06T16:59:14.16 0.1 negative manual P 123 59.8956 50 0.45 88
TV.SF13.HHN. 2018-12-06T16:59:13.94 0.1 undecidable manual P 126 58.1973 50 0.48 88
TV.SF01.EHZ. 2018-12-06T16:59:13.31 0.1 undecidable manual P 130 55.1004 50 0.33 91
IV.ARCI.HHZ. 2018-12-06T16:59:11.90 0.1 undecidable manual P 131 46.7199 50 0.2 95
IV.RIBO.EHZ.01 2018-12-06T16:59:10.24 0.6 undecidable manual S 179 20.0688 118 -0.67 44
IV.CASP.HHZ. 2018-12-06T16:59:10.63 0.1 undecidable manual P 201 40.3263 50 -0.07 99
IV.CSNT.HHZ. 2018-12-06T16:59:10.95 0.1 undecidable manual P 28 43.0236 50 -0.16 96
IV.RIBO.EHZ.01 2018-12-06T16:59:07.40 0.1 positive manual P 179 20.0688 118 -0.17 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RIBO.EHE.01 ML:1.8 0.00044484140000000005 0.1792 AML other m 2018-12-06T16:59:10.50
IV.CASP.HHE. ML:1.6 0.00014113265 0.2176 AML other m 2018-12-06T16:59:15.80
IV.CASP.HHN. ML:1.6 0.00013217972499999999 0.0768 AML other m 2018-12-06T16:59:15.88
IV.ARCI.HHN. ML:1.4 0.00006936854500000001 0.1664 AML other m 2018-12-06T16:59:17.89
IV.ARCI.HHE. ML:1.5 0.00008271034 1.872 AML other m 2018-12-06T16:59:18.02
TV.SF04.EHN. ML:1.6 0.0000803504755 1.8592 AML other m 2018-12-06T16:59:21.95
TV.SF01.EHN. ML:1.6 0.0000924556 0.2432 AML other m 2018-12-06T16:59:21.49
TV.SF01.EHE. ML:1.7 0.000109720965 0.3584 AML other m 2018-12-06T16:59:21.65
TV.SF04.EHE. ML:1.7 0.0001033518 0.1792 AML other m 2018-12-06T16:59:22.83
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