Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 04-12-2020 and time 10:11:02 (Italy) in region 4 km W Pratovecchio Stia (AR)

A magnitude ML 0.9 earthquake occured in region: 4 km W Pratovecchio Stia (AR), on

  • 04-12-2020 09:11:02 (UTC)
  • 04-12-2020 10:11:02 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.8, 11.68 at 2 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
Pratovecchio Stia AR 4 5845 5845
Castel San Niccolò AR 7 2707 8552
Montemignaio AR 8 566 9118
Poppi AR 11 6160 15278
Londa FI 11 1840 17118
Pelago FI 14 7660 24778
Ortignano Raggiolo AR 14 878 25656
San Godenzo FI 15 1167 26823
Rufina FI 16 7346 34169
Bibbiena AR 16 12241 46410
Dicomano FI 16 5515 51925
Reggello FI 17 16290 68215
Pontassieve FI 19 20603 88818
Rignano sull'Arno FI 20 8651 97469

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Firenze (382808 inhabitants)
40 Km E of Scandicci (50609 inhabitants)
40 Km NW of Arezzo (99543 inhabitants)
48 Km E of Prato (191150 inhabitants)
55 Km SW of Forlì (117913 inhabitants)
57 Km SW of Faenza (58541 inhabitants)
59 Km SW of Cesena (96758 inhabitants)
60 Km NE of Siena (53903 inhabitants)
62 Km S of Imola (69797 inhabitants)
63 Km E of Pistoia (90315 inhabitants)
77 Km W of Rimini (147750 inhabitants)
80 Km SW of Ravenna (159116 inhabitants)
82 Km SE of Bologna (386663 inhabitants)
95 Km E of Lucca (89046 inhabitants)
96 Km NW of Perugia (166134 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 0.9 2020-12-04
09:11:02		 43.8 11.68 2 2020-12-04
09:25:42		 Sala Sismica INGV-Roma 85195051
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-04 09:11:02 ± 0.12
Latitude 43.80 ± 0.01
Longitude 11.68 ± 0.01
Depth (km) 2 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85195051

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 860
Semi-minor axis of confidence ellipse (meter) 450
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 32
Circular confidence region, given by single value of horizontal uncertainty (meter) 860
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 156
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.27879
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 85195051
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-04 09:25:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.BRES.EHZ. 2020-12-04T09:12:34.84 3.0 undecidable manual Sg 4.11 0
IV.MFNL.HHZ. 2020-12-04T09:12:25.25 3.0 negative manual Pg 13.92 0
IV.TDS.HHZ. 2020-12-04T09:12:22.45 3.0 undecidable manual Pg 17.120001 0
IV.VULT.HHZ. 2020-12-04T09:11:51.47 3.0 undecidable manual Pn 3.58 0
MN.TRI.HHZ. 2020-12-04T09:11:46.27 3.0 positive manual Pg 7.53 0
IV.MBAL.EHZ. 2020-12-04T09:11:38.42 0.6 positive manual Pg 5.15 0.96
IT.LRNO.HNZ. 2020-12-04T09:11:34.39 0.3 undecidable manual Pn -1.08 1.44
ST.PANI.EHZ. 2020-12-04T09:11:31.28 1.0 positive manual Pn -6.21 0.27
IV.NARO.HHZ. 2020-12-04T09:11:20.81 3.0 undecidable manual Sn -1.91 0
IV.MAON.HHZ. 2020-12-04T09:11:17.71 3.0 undecidable manual Sn -0.52 0
IV.BRSN.HNZ. 2020-12-04T09:11:14.70 0.6 positive manual Pg 0.74 1.32
IV.LMD.HHZ. 2020-12-04T09:11:12.61 0.6 undecidable manual S 4 0.2788 93 -0.24 47
IV.CRE.HHN. 2020-12-04T09:11:12.17 0.6 undecidable manual S 132 0.2662 93 -0.19 48
IV.SEI.HHZ. 2020-12-04T09:11:11.94 3.0 undecidable manual P 0
IV.LMD.HHZ. 2020-12-04T09:11:07.74 0.3 undecidable manual P 4 0.2788 93 -0.56 65
IV.RUFI.EHZ. 2020-12-04T09:11:07.16 0.6 undecidable manual S 288 0.1286 97 0.09 50
IV.CRE.HHN. 2020-12-04T09:11:07.58 1.0 undecidable manual P 132 0.2662 93 -0.44 23
IV.NARO.HHZ. 2020-12-04T09:11:06.80 3.0 undecidable manual P -1.34 0
IV.RINC.HHZ. 2020-12-04T09:11:06.30 0.6 undecidable manual S 329 0.1016 98 0.25 49
IV.ASQU.HHZ. 2020-12-04T09:11:05.53 0.6 undecidable manual S 92 0.0791 101 0.35 48
IV.ASQU.HHZ. 2020-12-04T09:11:04.00 0.3 positive manual P 92 0.0791 101 0.13 75
IV.RUFI.EHZ. 2020-12-04T09:11:04.92 0.3 undecidable manual P 288 0.1286 97 -0.04 76
IV.RINC.HHZ. 2020-12-04T09:11:04.49 0.1 undecidable manual P 329 0.1016 98 0.12 100
IV.MCIV.CHZ. 2020-12-04T09:11:02.23 3.0 undecidable manual P 5.26 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ASQU.HHE. ML:0 8.501352E-5 0.2176 AML other m 2020-12-04T09:11:06.03
IV.ASQU.HHN. ML:0 9.5208015E-5 0.256 AML other m 2020-12-04T09:11:06.32
IV.RINC.HHE. ML:0.8 0.00011014429 0.1344 AML other m 2020-12-04T09:11:06.38
IV.RINC.HHN. ML:0.8 0.0001072106 0.3008 AML other m 2020-12-04T09:11:06.86
IV.LMD.HHE. ML:1 4.835794E-5 0.1216 AML other m 2020-12-04T09:11:13.15
IV.LMD.HHN. ML:1 4.943271E-5 0.3584 AML other m 2020-12-04T09:11:12.58
ST.PANI.EHN. ML:2 1.9891089E-5 0.3456 AML other m 2020-12-04T09:11:48.49
IV.MBAL.EHE. ML:2.3 4.9697912E-5 0.1344 AML other m 2020-12-04T09:11:41.80
IV.MBAL.EHN. ML:2.3 4.3196265E-5 0.1152 AML other m 2020-12-04T09:11:41.39
IV.MBAL.HNE. ML:2.8 0.00016999285 0.6592 AML other m 2020-12-04T09:12:20.48
IV.MBAL.HNN. ML:2.8 0.0001504523 0.6144 AML other m 2020-12-04T09:12:27.71
IV.VULT.HHE. ML:3.5 0.0001223425 0.6016 AML other m 2020-12-04T09:13:01.73
IV.VULT.HHN. ML:3.6 0.0001537542 0.9216 AML other m 2020-12-04T09:12:31.85
IV.VULT.HNE. ML:3.6 0.000170819 0.4928 AML other m 2020-12-04T09:13:02.04
IV.VULT.HNN. ML:3.7 0.000203957287 0.6848 AML other m 2020-12-04T09:12:51.15
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