Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 04-08-2018 and time 19:13:12 (Italy) in region 1 km E Bolano (SP)

A magnitude ML 1.0 earthquake occured in region: 1 km E Bolano (SP), on

  • 04-08-2018 17:13:12 (UTC)
  • 04-08-2018 19:13:12 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1860, 9.9080 at 7 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
Bolano SP 1 7813 7813
Santo Stefano di Magra SP 3 9360 17173
Podenzana MS 4 2180 19353
Follo SP 4 6337 25690
Vezzano Ligure SP 5 7356 33046
Aulla MS 6 11263 44309
Tresana MS 7 2044 46353
Arcola SP 8 10607 56960
Calice al Cornoviglio SP 9 1138 58098
Sarzana SP 9 21976 80074
Fosdinovo MS 11 4883 84957
La Spezia SP 11 93959 178916
Beverino SP 11 2429 181345
Riccò del Golfo di Spezia SP 12 3698 185043
Lerici SP 12 10228 195271
Villafranca in Lunigiana MS 12 4770 200041
Castelnuovo Magra SP 13 8415 208456
Ameglia SP 14 4365 212821
Licciana Nardi MS 14 4949 217770
Rocchetta di Vara SP 14 703 218473
Pignone SP 15 565 219038
Mulazzo MS 15 2424 221462
Borghetto di Vara SP 15 938 222400
Portovenere SP 15 3630 226030
Ortonovo SP 16 8277 234307
Brugnato SP 16 1270 235577
Bagnone MS 16 1887 237464
Filattiera MS 17 2309 239773
Riomaggiore SP 17 1576 241349
Zignago SP 17 532 241881
Fivizzano MS 18 7925 249806
Vernazza SP 19 848 250654
Carrara MS 19 63133 313787

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km NE of La Spezia (93959 inhabitants)
19 Km NW of Carrara (63133 inhabitants)
25 Km NW of Massa (69479 inhabitants)
45 Km NW of Viareggio (62467 inhabitants)
61 Km NW of Lucca (89046 inhabitants)
66 Km NW of Pisa (89158 inhabitants)
76 Km SW of Parma (192836 inhabitants)
77 Km NW of Livorno (159219 inhabitants)
81 Km SW of Reggio nell'Emilia (171345 inhabitants)
82 Km E of Genova (586655 inhabitants)
85 Km W of Pistoia (90315 inhabitants)
96 Km SW of Modena (184973 inhabitants)
98 Km S of Piacenza (102191 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
Reviewed
Rev100 		ML 1.0 2018-08-04
17:13:12		 44.1858 9.908 7 2018-08-04
17:18:20		 Sala Sismica INGV-Roma 59361741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-08-04 17:13:12 ± 0.19
Latitude 44.1858 ± 0.0090
Longitude 9.9080 ± 0.0100
Depth (km) 7 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 59361741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 926
Semi-minor axis of confidence ellipse (meter) 387
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 11
Circular confidence region, given by single value of horizontal uncertainty (meter) 930.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 99
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.49912
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 59361741
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-08-04 17:18:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MSSA.HHZ. 2018-08-04T17:13:24.33 0.3 undecidable manual S 295 34.2435 101 -0.45 68
GU.MAIM.HHZ. 2018-08-04T17:13:22.98 0.3 undecidable manual P 123 55.4001 50 -0.22 68
GU.GRAM.HHZ. 2018-08-04T17:13:20.31 0.3 undecidable manual P 20 36.1416 100 0.28 70
GU.EQUI.HHZ. 2018-08-04T17:13:19.48 0.1 undecidable manual S 96 19.6692 109 -0.38 94
IV.MSSA.HHZ. 2018-08-04T17:13:19.78 0.1 undecidable manual P 295 34.2435 101 0.12 97
IV.PLMA.HHZ. 2018-08-04T17:13:18.48 0.1 undecidable manual S 196 15.6732 113 -0.11 100
GU.EQUI.HHZ. 2018-08-04T17:13:17.14 0.1 negative manual P 96 19.6692 109 0.32 95
IV.PLMA.HHZ. 2018-08-04T17:13:16.41 0.1 undecidable manual P 196 15.6732 113 0.32 96
IV.MBAL.EHZ. 2018-08-04T17:13:12.46 3.0 undecidable manual P 0
IV.NDIM.HHZ. 2018-08-04T17:13:04.94 3.0 negative manual P 0.01 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.EQUI.HHE. ML:1.1 0.00009975 0.7 AML other m 2018-08-04T17:13:19.24
GU.EQUI.HHN. ML:1.0 0.00007685 1.32 AML other m 2018-08-04T17:13:20.90
GU.GRAM.HHE. ML:1.0 0.0000413 0.66 AML other m 2018-08-04T17:13:26.37
GU.GRAM.HHN. ML:0.9 0.00003715 1.38 AML other m 2018-08-04T17:13:27.93
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