Earthquake with magnitude of ML 1.1 on date 04-12-2018 and time 19:45:24 (Italy) in region 4 km NE Vecchiano (PI)

A magnitude ML 1.1 earthquake occured in region: 4 km NE Vecchiano (PI), on

  • 04-12-2018 18:45:24 (UTC)
  • 04-12-2018 19:45:24 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.81, 10.42 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Vecchiano PI 4 12189 12189
San Giuliano Terme PI 6 31399 43588
Lucca LU 8 89046 132634
Massarosa LU 9 22471 155105
Pisa PI 11 89158 244263
Calci PI 13 6426 250689
Capannori LU 14 46252 296941
Viareggio LU 15 62467 359408
Porcari LU 17 8845 368253
Camaiore LU 17 32513 400766
Buti PI 17 5791 406557
Pescaglia LU 17 3526 410083
Vicopisano PI 18 8559 418642
Cascina PI 19 45257 463899
Bientina PI 20 8062 471961

Municipalities with at least 50000 inhabitants

An earthquake occurred to
8 Km W of Lucca (89046 inhabitants)
11 Km N of Pisa (89158 inhabitants)
15 Km E of Viareggio (62467 inhabitants)
30 Km N of Livorno (159219 inhabitants)
33 Km SE of Massa (69479 inhabitants)
39 Km SE of Carrara (63133 inhabitants)
43 Km W of Pistoia (90315 inhabitants)
55 Km W of Prato (191150 inhabitants)
57 Km SE of La Spezia (93959 inhabitants)
62 Km W of Scandicci (50609 inhabitants)
68 Km W of Firenze (382808 inhabitants)
92 Km NW of Siena (53903 inhabitants)
100 Km S of Reggio nell'Emilia (171345 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
Rev 1000 ML 1.1 2018-12-04
18:45:24
43.81 10.42 11 2019-06-04
09:16:16
Bollettino Sismico Italiano INGV 68360161
Rev 100 ML 1.2 2018-12-04
18:45:24
43.81 10.41 11 2018-12-04
18:56:23
Sala Sismica INGV-Roma 63641401
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-12-04 18:45:24 ± 0.15
Latitude 43.81 ± 0.01
Longitude 10.42 ± 0.02
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 68360161

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1237
Semi-minor axis of confidence ellipse (meter) 841
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 81
Circular confidence region, given by single value of horizontal uncertainty (meter) 1240
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 193
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.11601
Epicentral distance of station farthest from the epicenter (degree) 0.4011
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 63641401
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-12-04 18:56:23

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 7
Type of magnitude ML
Reference to an origin 68360161
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-05-08 14:54:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.EQUI.HHZ. 2018-12-04T18:45:38.08 0.3 undecidable manual S 332 0.4011 91 -0.59 63
GU.SARM.EHN. 2018-12-04T18:45:37.76 0.6 undecidable manual S 358 0.3714 91 -0.05 47
GU.POPM.HHZ. 2018-12-04T18:45:36.44 0.6 undecidable manual S 46 0.3381 91 -0.38 44
GU.EQUI.HHZ. 2018-12-04T18:45:32.62 0.1 undecidable manual P 332 0.4011 91 0.01 94
GU.CARD.HHZ. 2018-12-04T18:45:32.97 0.6 undecidable manual S 13 0.2194 92 -0.31 46
GU.SARM.EHN. 2018-12-04T18:45:32.35 0.3 undecidable manual P 358 0.3714 91 0.24 68
GU.POPM.HHZ. 2018-12-04T18:45:31.71 0.1 positive manual P 46 0.3381 91 0.17 93
GU.MAIM.HHZ. 2018-12-04T18:45:30.04 0.6 undecidable manual S 28 0.116 108 -0.2 49
IV.PII.HHZ. 2018-12-04T18:45:30.04 0.6 undecidable manual S 139 0.1196 106 -0.31 47
GU.CARD.HHZ. 2018-12-04T18:45:29.64 0.1 undecidable manual P 13 0.2194 92 0.14 95
IV.PII.HHZ. 2018-12-04T18:45:27.82 0.1 undecidable manual P 139 0.1196 106 0.01 100
GU.MAIM.HHZ. 2018-12-04T18:45:27.99 0.1 undecidable manual P 28 0.116 108 0.25 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PII.HHE. ML:1.4 0.0002755 0.28 AML other m 2018-12-04T18:45:30.06
GU.MAIM.HHE. ML:1.2 0.000173 0.1 AML other m 2018-12-04T18:45:30.17
GU.MAIM.HHN. ML:1.2 0.000179 0.36 AML other m 2018-12-04T18:45:30.23
GU.CARD.HHN. ML:0 9.56E-5 0.14 AML other m 2018-12-04T18:45:33.39
GU.CARD.HHE. ML:1 6.18E-5 0.52 AML other m 2018-12-04T18:45:33.69
GU.POPM.HHN. ML:0.8 2.7187205E-5 0.1824 AML other m 2018-12-04T18:45:35.67
GU.POPM.HHE. ML:0.7 1.9402652E-5 0.1792 AML other m 2018-12-04T18:45:38.75
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