Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.9 on date 01-04-2018 and time 14:12:20 (Italy) in region Costa Toscana settentrionale (Massa Carrara, Lucca, Pisa)

A magnitude ML 1.9 earthquake occured in region: Costa Toscana settentrionale (Massa Carrara, Lucca, Pisa), on

  • 01-04-2018 12:12:20 (UTC)
  • 01-04-2018 14:12:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.7650, 10.0630 at 10 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.

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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
Viareggio LU 19 62467 62467

Municipalities with at least 50000 inhabitants

An earthquake occurred to
19 Km SW of Viareggio (62467 inhabitants)
28 Km W of Pisa (89158 inhabitants)
31 Km NW of Livorno (159219 inhabitants)
31 Km S of Massa (69479 inhabitants)
35 Km S of Carrara (63133 inhabitants)
36 Km W of Lucca (89046 inhabitants)
43 Km SE of La Spezia (93959 inhabitants)
71 Km W of Pistoia (90315 inhabitants)
84 Km W of Prato (191150 inhabitants)
90 Km W of Scandicci (50609 inhabitants)
96 Km W of Firenze (382808 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 1.9 2018-04-01
12:12:20		 43.7648 10.0632 10 2019-04-24
14:49:35		 Bollettino Sismico Italiano INGV 57519191
Reviewed
Rev100 		ML 1.7 2018-04-01
12:12:20		 43.7718 10.0912 2 2018-04-01
12:19:50		 Sala Sismica INGV-Roma 55021871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-04-01 12:12:20 ± 0.25
Latitude 43.7648 ± 0.0090
Longitude 10.0632 ± 0.0087
Depth (km) 10 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 57519191

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 813
Semi-minor axis of confidence ellipse (meter) 728
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 201
Circular confidence region, given by single value of horizontal uncertainty (meter) 810.0
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 20
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.66190
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 55021871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-04-01 12:19:50

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 57519191
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2018-06-27 14:53:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
RF.GEPF.HHZ. 2018-04-01T12:14:07.39 3.0 undecidable manual Sg 13.77 0
IV.MTCE.HHZ. 2018-04-01T12:13:41.78 3.0 undecidable manual Sg 4.67 0
IV.MGAB.HHZ. 2018-04-01T12:13:14.87 3.0 undecidable manual Sn 0.05 0
GU.POPM.HHZ. 2018-04-01T12:12:41.09 0.6 undecidable manual S 61 63.5919 50 0.61 42
IV.BDI.HNZ. 2018-04-01T12:12:37.90 1.0 undecidable manual S 52 53.9016 50 0.01 25
GU.CARD.HHZ. 2018-04-01T12:12:35.20 0.6 undecidable manual S 49 44.3223 50 -0.13 50
GU.EQUI.HHZ. 2018-04-01T12:12:35.50 0.6 undecidable manual S 9 45.0216 50 -0.04 51
GU.MAIM.HHZ. 2018-04-01T12:12:33.40 0.6 undecidable manual S 64 38.0286 50 -0.27 49
IV.MAGO.HHE. 2018-04-01T12:12:33.60 0.3 undecidable manual P 139 72.5718 50 0.1 71
IV.PLMA.HHZ. 2018-04-01T12:12:33.00 0.3 undecidable manual S 332 35.742 50 -0.06 77
IV.CRMI.HHZ. 2018-04-01T12:12:33.85 0.3 undecidable manual P 87 73.4709 50 0.21 69
GU.POPM.HHZ. 2018-04-01T12:12:32.24 0.3 undecidable manual P 61 63.5919 50 0.12 72
GU.SARM.EHZ. 2018-04-01T12:12:30.82 0.3 undecidable manual P 30 53.7018 50 0.22 72
IV.BDI.HNZ. 2018-04-01T12:12:30.61 0.1 undecidable manual P 52 53.9016 50 -0.01 100
MN.VLC.HHZ. 2018-04-01T12:12:30.41 1.0 positive manual P 30 50.8158 50 0.26 24
GU.EQUI.HHZ. 2018-04-01T12:12:29.57 1.0 undecidable manual P 9 45.0216 50 0.3 24
GU.CARD.HHZ. 2018-04-01T12:12:28.95 0.1 positive manual P 49 44.3223 50 -0.2 98
GU.MAIM.HHZ. 2018-04-01T12:12:27.88 0.3 positive manual P 64 38.0286 50 -0.31 73
IV.PLMA.HHZ. 2018-04-01T12:12:27.83 0.6 negative manual P 332 35.742 50 0 52
IV.PII.HHZ. 2018-04-01T12:12:27.84 0.3 undecidable manual P 97 37.3293 50 -0.23 74
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PII.HHN. ML:1.9 0.00032824344999999997 0.4608 AML other m 2018-04-01T12:12:32.48
GU.MAIM.HHN. ML:1.6 0.00013665337 0.7808 AML other m 2018-04-01T12:12:33.05
IV.PLMA.HHN. ML:1.8 0.00026283895 0.3584 AML other m 2018-04-01T12:12:33.23
IV.PLMA.HHE. ML:2.1 0.0004800414 0.2432 AML other m 2018-04-01T12:12:33.32
IV.PII.HHE. ML:1.8 0.00022503239999999998 0.3584 AML other m 2018-04-01T12:12:33.24
GU.MAIM.HHE. ML:1.7 0.00017246200000000002 0.4224 AML other m 2018-04-01T12:12:33.72
GU.CARD.HHE. ML:2.2 0.0004884427999999999 0.096 AML other m 2018-04-01T12:12:36.03
GU.EQUI.HHN. ML:1.6 0.0001027183235 0.1024 AML other m 2018-04-01T12:12:38.82
GU.EQUI.HHE. ML:1.8 0.00019797294999999998 0.1408 AML other m 2018-04-01T12:12:40.32
GU.CARD.HHN. ML:2.2 0.0005019432 0.1664 AML other m 2018-04-01T12:12:40.34
MN.VLC.HNN. ML:1.9 0.00019442884999999998 0.16 AML other m 2018-04-01T12:12:41.23
MN.VLC.HHN. ML:1.9 0.000199051425 0.16 AML other m 2018-04-01T12:12:41.23
MN.VLC.HHE. ML:1.9 0.00018503205 0.2624 AML other m 2018-04-01T12:12:41.44
MN.VLC.HNE. ML:1.9 0.00018745965000000001 0.2624 AML other m 2018-04-01T12:12:41.44
GU.SARM.EHN. ML:2.1 0.00027256775 0.384 AML other m 2018-04-01T12:12:41.64
GU.SARM.EHE. ML:2.1 0.00028489 0.4032 AML other m 2018-04-01T12:12:41.77
GU.POPM.HHN. ML:2.3 0.0003564447 0.1792 AML other m 2018-04-01T12:12:45.93
GU.POPM.HHE. ML:2.3 0.00035535115 1.8208 AML other m 2018-04-01T12:12:46.07
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