INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 1.3 on date 17-04-2018 and time 11:07:02 (Italy) in region 5 km SW Massarosa (LU)

A magnitude ML 1.3 earthquake occured in region: 5 km SW Massarosa (LU), on

  • 17-04-2018 09:07:02 (UTC)
  • 17-04-2018 11:07:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.83, 10.31 at 4 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
Massarosa LU 5 22471 22471
Viareggio LU 7 62467 84938
Vecchiano PI 8 12189 97127
Camaiore LU 12 32513 129640
San Giuliano Terme PI 13 31399 161039
Pisa PI 15 89158 250197
Lucca LU 15 89046 339243
Pietrasanta LU 16 24007 363250
Pescaglia LU 17 3526 366776
Forte dei Marmi LU 19 7510 374286
Stazzema LU 19 3193 377479
Seravezza LU 20 13073 390552

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km SE of Viareggio (62467 inhabitants)
15 Km NW of Pisa (89158 inhabitants)
15 Km W of Lucca (89046 inhabitants)
27 Km SE of Massa (69479 inhabitants)
31 Km N of Livorno (159219 inhabitants)
33 Km SE of Carrara (63133 inhabitants)
50 Km SE of La Spezia (93959 inhabitants)
50 Km W of Pistoia (90315 inhabitants)
63 Km W of Prato (191150 inhabitants)
70 Km W of Scandicci (50609 inhabitants)
76 Km W of Firenze (382808 inhabitants)
100 Km NW of Siena (53903 inhabitants)
100 Km S of Reggio nell'Emilia (171345 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
Rev 100 ML 1.3 2018-04-17
09:07:02
43.83 10.31 4 2018-04-17
09:18:05
Sala Sismica INGV-Roma 55729611
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-04-17 09:07:02 ± 0.14
Latitude 43.83 ± 0.01
Longitude 10.31 ± 0.01
Depth (km) 4 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 55729611

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 685
Semi-minor axis of confidence ellipse (meter) 301
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 222
Circular confidence region, given by single value of horizontal uncertainty (meter) 680
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 179
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.74104
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 55729611
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-04-17 09:18:05
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FNVD.HHE. 2018-04-17T09:07:21.53 0.3 undecidable manual P 0.6736 5.25 0
GU.MSSA.HHZ. 2018-04-17T09:07:19.86 3.0 undecidable manual P 0
IV.OSSC.HNN. 2018-04-17T09:07:17.54 0.6 undecidable manual P 114 0.741 50 0.12 44
IV.PLMA.HHZ. 2018-04-17T09:07:17.38 0.3 undecidable manual S 304 0.3966 95 -0.34 67
GU.MOCL.EHZ. 2018-04-17T09:07:17.58 3.0 undecidable manual P 0
GU.SARM.EHZ. 2018-04-17T09:07:16.46 0.3 undecidable manual S 10 0.3606 95 0.14 71
GU.EQUI.HHZ. 2018-04-17T09:07:15.44 0.1 undecidable manual S 341 0.3552 95 -0.7 81
GU.GSCL.HHE. 2018-04-17T09:07:14.50 0.3 undecidable manual P 21 0.5576 50 0.22 67
IV.BDI.HHZ. 2018-04-17T09:07:13.83 0.3 undecidable manual S 41 0.3103 96 -0.57 64
IV.MTCR.EHE. 2018-04-17T09:07:13.79 0.3 undecidable manual P 68 0.5351 50 -0.11 69
IV.CRMI.HHZ. 2018-04-17T09:07:12.81 0.1 undecidable manual P 94 0.482 50 -0.19 91
GU.CARD.HHZ. 2018-04-17T09:07:11.47 0.3 undecidable manual S 32 0.232 98 0.07 73
IV.PLMA.HHZ. 2018-04-17T09:07:11.70 0.1 undecidable manual P 304 0.3966 95 0.46 87
GU.EQUI.HHZ. 2018-04-17T09:07:10.50 0.1 undecidable manual P 341 0.3552 95 0.17 94
GU.SARM.EHZ. 2018-04-17T09:07:10.40 0.1 undecidable manual P 10 0.3606 95 -0.03 96
MN.VLC.HHZ. 2018-04-17T09:07:10.00 0.3 undecidable manual P 9 0.3345 96 0.14 71
IV.BDI.HHZ. 2018-04-17T09:07:09.28 0.1 undecidable manual P 41 0.3103 96 -0.04 97
IV.PII.HHZ. 2018-04-17T09:07:09.22 0.3 undecidable manual S 125 0.1871 100 -0.5 68
GU.MAIM.HHZ. 2018-04-17T09:07:08.62 0.1 undecidable manual S 57 0.1547 102 0.14 98
GU.CARD.HHZ. 2018-04-17T09:07:07.87 0.1 undecidable manual P 32 0.232 98 0.28 94
IV.PII.HHZ. 2018-04-17T09:07:06.63 0.1 undecidable manual P 125 0.1871 100 0.01 100
GU.MAIM.HHZ. 2018-04-17T09:07:06.35 0.1 undecidable manual P 57 0.1547 102 0.45 92
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BDI.HHN. ML:1.2 6.655E-5 0.28 AML other m 2018-04-17T09:07:14.83
GU.MAIM.HHN. ML:1.4 0.0002695 0.7 AML other m 2018-04-17T09:07:09.07
IV.PII.HHN. ML:1.3 0.0001645 0.54 AML other m 2018-04-17T09:07:10.70
IV.PII.HHE. ML:1.4 0.000202 0.18 AML other m 2018-04-17T09:07:10.47
GU.CARD.HHE. ML:1.7 0.000295 0.18 AML other m 2018-04-17T09:07:11.71
GU.CARD.HHN. ML:1.8 0.000396 0.32 AML other m 2018-04-17T09:07:12.07
IV.BDI.HHE. ML:1.1 5.3E-5 0.6 AML other m 2018-04-17T09:07:17.15
GU.MAIM.HHE. ML:1.4 0.0002795 1.58 AML other m 2018-04-17T09:07:08.97
GU.EQUI.HHE. ML:1 3.675531E-5 0.16 AML other m 2018-04-17T09:07:15.77
GU.EQUI.HHN. ML:1 3.844544E-5 0.0768 AML other m 2018-04-17T09:07:16.01
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