INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 1.4 on date 12-05-2018 and time 06:40:38 (Italy) in region 1 km S Sarzana (SP)

A magnitude ML 1.4 earthquake occured in region: 1 km S Sarzana (SP), on

  • 12-05-2018 04:40:38 (UTC)
  • 12-05-2018 06:40:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1, 9.96 at 10 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
Sarzana SP 1 21976 21976
Ameglia SP 4 4365 26341
Arcola SP 5 10607 36948
Castelnuovo Magra SP 5 8415 45363
Lerici SP 5 10228 55591
Fosdinovo MS 6 4883 60474
Ortonovo SP 7 8277 68751
Vezzano Ligure SP 8 7356 76107
Santo Stefano di Magra SP 8 9360 85467
Follo SP 10 6337 91804
La Spezia SP 11 93959 185763
Bolano SP 11 7813 193576
Portovenere SP 11 3630 197206
Carrara MS 11 63133 260339
Podenzana MS 12 2180 262519
Aulla MS 12 11263 273782
Tresana MS 15 2044 275826
Massa MS 16 69479 345305
Riccò del Golfo di Spezia SP 17 3698 349003
Riomaggiore SP 18 1576 350579
Beverino SP 18 2429 353008
Calice al Cornoviglio SP 19 1138 354146
Licciana Nardi MS 19 4949 359095
Montignoso MS 20 10323 369418
Fivizzano MS 20 7925 377343

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km E of La Spezia (93959 inhabitants)
11 Km W of Carrara (63133 inhabitants)
16 Km W of Massa (69479 inhabitants)
35 Km NW of Viareggio (62467 inhabitants)
52 Km NW of Lucca (89046 inhabitants)
56 Km NW of Pisa (89158 inhabitants)
67 Km NW of Livorno (159219 inhabitants)
79 Km W of Pistoia (90315 inhabitants)
83 Km SW of Parma (192836 inhabitants)
85 Km SW of Reggio nell'Emilia (171345 inhabitants)
89 Km E of Genova (586655 inhabitants)
94 Km W of Prato (191150 inhabitants)
98 Km SW of Modena (184973 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 1.4 2018-05-12
04:40:38
44.1 9.96 10 2018-05-12
05:00:32
Sala Sismica INGV-Roma 56780061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-05-12 04:40:38 ± 0.15
Latitude 44.10 ± 0.01
Longitude 9.96 ± 0.01
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 56780061

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1520
Semi-minor axis of confidence ellipse (meter) 587
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 174
Circular confidence region, given by single value of horizontal uncertainty (meter) 1520
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 103
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 15
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.55668
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 2
Type of magnitude ML
Reference to an origin 56780061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-05-12 05:00:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.LPEL.HHZ. 2018-05-12T04:42:18.55 3.0 undecidable manual Sn -6.18 0
IV.SRES.HHZ. 2018-05-12T04:42:02.05 3.0 undecidable manual Sg 3.31 0
IV.T1220.EHZ. 2018-05-12T04:42:00.48 3.0 undecidable manual Sg 6.17 0
IV.VVLD.HHZ. 2018-05-12T04:41:41.84 3.0 negative manual Pg 5.53 0
IV.MCIV.HHZ. 2018-05-12T04:41:13.75 3.0 positive manual Pg 0.28 0
IV.SARZ.HHZ. 2018-05-12T04:41:00.07 3.0 negative manual P -3.06 0
IV.MSSA.HHZ. 2018-05-12T04:40:52.55 0.1 undecidable manual S 304 0.3831 50 -0.45 93
MN.VLC.HHZ. 2018-05-12T04:40:50.32 0.1 undecidable manual S 79 0.3103 50 -0.54 92
GU.SARM.EHZ. 2018-05-12T04:40:50.80 0.1 undecidable manual S 75 0.3256 50 -0.51 93
IV.PII.HHZ. 2018-05-12T04:40:50.34 0.6 undecidable manual P 133 0.5567 50 0.29 46
IV.BDI.HHZ. 2018-05-12T04:40:48.64 0.1 undecidable manual P 95 0.4578 50 0.29 95
GU.MAIM.HHZ. 2018-05-12T04:40:48.12 0.6 undecidable manual P 116 0.4254 50 0.31 47
GU.GRAM.HHZ. 2018-05-12T04:40:48.12 0.1 positive manual P 11 0.3957 50 0.82 80
IV.MSSA.HHZ. 2018-05-12T04:40:47.53 1.0 negative manual P 304 0.3831 50 0.45 23
GU.CARD.HHZ. 2018-05-12T04:40:47.16 1.0 positive manual P 101 0.3822 50 0.09 25
MN.VLC.HHZ. 2018-05-12T04:40:46.09 0.6 undecidable manual P 79 0.3103 50 0.25 49
GU.SARM.EHZ. 2018-05-12T04:40:46.45 0.6 negative manual P 75 0.3256 50 0.35 48
GU.EQUI.HHZ. 2018-05-12T04:40:45.48 0.1 undecidable manual S 65 0.152 121 -0.32 100
GU.EQUI.HHZ. 2018-05-12T04:40:43.26 0.1 positive manual P 65 0.152 121 0.34 100
IV.PLMA.HHZ. 2018-05-12T04:40:43.64 0.1 undecidable manual S 236 0.0935 134 -0.37 100
IV.PLMA.HHZ. 2018-05-12T04:40:42.08 0.6 undecidable manual P 236 0.0935 134 0.19 52
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.PLMA.HHN. ML:1.5 0.0004085 0.14 AML other m 2018-05-12T04:40:43.83
IV.PLMA.HHE. ML:1.2 0.000204 0.38 AML other m 2018-05-12T04:40:43.99
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