Earthquake with magnitude of ML 0.4 on date 18-12-2020 and time 06:08:15 (Italy) in region 2 km S San Godenzo (FI)

A magnitude ML 0.4 earthquake occured in region: 2 km S San Godenzo (FI), on

  • 18-12-2020 05:08:15 (UTC)
  • 18-12-2020 06:08:15 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.91, 11.62 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
San Godenzo FI 2 1167 1167
Londa FI 7 1840 3007
Dicomano FI 8 5515 8522
Vicchio FI 13 8044 16566
Rufina FI 14 7346 23912
Premilcuore FC 15 799 24711
Pratovecchio Stia AR 16 5845 30556
Pelago FI 18 7660 38216
Portico e San Benedetto FC 19 756 38972
Marradi FI 19 3139 42111
Montemignaio AR 19 566 42677
Borgo San Lorenzo FI 19 18211 60888
Castel San Niccolò AR 20 2707 63595

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km E of Firenze (382808 inhabitants)
39 Km E of Scandicci (50609 inhabitants)
42 Km E of Prato (191150 inhabitants)
47 Km SW of Faenza (58541 inhabitants)
49 Km SW of Forlì (117913 inhabitants)
50 Km S of Imola (69797 inhabitants)
54 Km NW of Arezzo (99543 inhabitants)
56 Km W of Cesena (96758 inhabitants)
56 Km E of Pistoia (90315 inhabitants)
69 Km SE of Bologna (386663 inhabitants)
70 Km NE of Siena (53903 inhabitants)
73 Km SW of Ravenna (159116 inhabitants)
78 Km W of Rimini (147750 inhabitants)
90 Km E of Lucca (89046 inhabitants)
99 Km SE of Modena (184973 inhabitants)
100 Km E of Pisa (89158 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.4 2020-12-18
05:08:15
43.91 11.62 8 2020-12-18
05:13:39
Sala Sismica INGV-Roma 85509101
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-18 05:08:15 ± 0.08
Latitude 43.91 ± 0.00
Longitude 11.62 ± 0.00
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 85509101

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 239
Semi-minor axis of confidence ellipse (meter) 101
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 331
Circular confidence region, given by single value of horizontal uncertainty (meter) 240
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 78
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.18076
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 85509101
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-18 05:13:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ACATE.EHZ. 2020-12-18T05:09:40.96 3.0 positive manual Pn 6.79 0
CR.ZAG.BHZ. 2020-12-18T05:09:10.40 3.0 negative manual Pn 9.27 0
IV.LAV9.HHZ. 2020-12-18T05:09:08.67 3.0 undecidable manual Sg 13.86 0
IV.VOBA.HNZ. 2020-12-18T05:09:08.31 3.0 undecidable manual Sn -1.29 0
IV.BOZZ.EHZ. 2020-12-18T05:09:00.30 3.0 undecidable manual Sg 2.21 0
IX.MNT3.HHZ.02 2020-12-18T05:08:59.96 3.0 positive manual Pn 6.77 0
IV.VIVA.HHZ. 2020-12-18T05:08:52.95 3.0 undecidable manual Sn -1.19 0
IV.VIVA.HHZ. 2020-12-18T05:08:41.31 3.0 negative manual Pg 11.58 0
IV.RMP.HHZ. 2020-12-18T05:08:39.19 3.0 positive manual Pg 10.42 0
IV.BOZZ.EHZ. 2020-12-18T05:08:34.23 3.0 positive manual Pg 2.28 0
IV.FIR.HHZ. 2020-12-18T05:08:31.82 3.0 undecidable manual Sg 0.57 0
IV.MNTV.HNZ. 2020-12-18T05:08:30.97 3.0 undecidable manual Pn -0.76 0
IV.FDMO.HHZ. 2020-12-18T05:08:25.61 3.0 negative manual P 2.06 0
IV.SRES.HHZ. 2020-12-18T05:08:24.58 3.0 undecidable manual Pn 0.77 0
IV.SFI.EHZ. 2020-12-18T05:08:22.03 0.3 undecidable manual S 91 0.1655 113 0.04 74
IV.LMD.HHZ. 2020-12-18T05:08:22.53 0.3 undecidable manual S 21 0.1808 111 -0.01 74
IV.ASQU.HHZ. 2020-12-18T05:08:22.16 0.3 undecidable manual S 132 0.1673 113 0.11 73
IV.LMD.HHZ. 2020-12-18T05:08:19.22 0.6 undecidable manual P 21 0.1808 111 -0.16 48
IV.RONT.HHZ. 2020-12-18T05:08:19.04 0.3 undecidable manual P 303 0.1574 114 0.12 73
IV.RUFI.EHZ. 2020-12-18T05:08:19.92 0.3 undecidable manual S 228 0.1052 124 -0.04 75
IV.SFI.EHZ. 2020-12-18T05:08:19.18 1.0 undecidable manual P 91 0.1655 113 0.11 24
IV.ASQU.HHZ. 2020-12-18T05:08:18.96 0.1 undecidable manual P 132 0.1673 113 -0.14 96
IV.RINC.HHZ. 2020-12-18T05:08:17.87 0.3 undecidable manual S 199 0.0234 161 -0.07 75
IV.RUFI.EHZ. 2020-12-18T05:08:17.89 0.1 undecidable manual P 228 0.1052 124 0 100
IV.RINC.HHZ. 2020-12-18T05:08:16.82 0.1 negative manual P 199 0.0234 161 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RINC.HHN. ML:0 0.000316 1.76 AML other m 2020-12-18T05:08:17.99
IV.RINC.HHE. ML:0 0.000212 0.14 AML other m 2020-12-18T05:08:18.00
IV.SFI.EHN. ML:0.6 2.78E-5 1.04 AML other m 2020-12-18T05:08:22.45
IV.SFI.EHE. ML:0.2 1.715E-5 0.08 AML other m 2020-12-18T05:08:22.72
IV.LMD.HHE. ML:0.5 2.54E-5 1.36 AML other m 2020-12-18T05:08:23.25
IV.LMD.HHN. ML:0.6 2.89E-5 1.08 AML other m 2020-12-18T05:08:23.80
IV.FIR.HHN. ML:1.9 0.0003395 1.62 AML other m 2020-12-18T05:08:50.11
IV.FIR.HHE. ML:1.8 0.000301 0.08 AML other m 2020-12-18T05:08:50.20
IV.VIVA.HHE. ML:3.6 0.0007895 0.16 AML other m 2020-12-18T05:08:57.86
IV.VIVA.HHN. ML:3.5 0.000575 1.56 AML other m 2020-12-18T05:08:58.11
IV.VOBA.HNE. ML:3.3 0.000525 0.18 AML other m 2020-12-18T05:09:18.30
IV.VOBA.HNN. ML:3.4 0.00061 0.92 AML other m 2020-12-18T05:09:20.05
IV.RUFI.EHE. ML:0.1 1.687452E-5 0.1984 AML other m 2020-12-18T05:08:20.12
IV.RUFI.EHN. ML:0.3 2.746581E-5 0.1216 AML other m 2020-12-18T05:08:20.04
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download