Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (explosion) with magnitude of ML 1.7 on date 19-09-2018 and time 12:20:26 (Italy) in region Costa Ligure Occidentale (Imperia)

A magnitude ML 1.7 (explosion) earthquake occured in region: Costa Ligure Occidentale (Imperia), on

  • 19-09-2018 10:20:26 (UTC)
  • 19-09-2018 12:20:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.8310, 8.1690 at 0 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Event type: explosion.

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
Diano Marina IM 11 5977 5977
Cervo IM 11 1187 7164
San Bartolomeo al Mare IM 12 3129 10293
Imperia IM 13 42034 52327
Diano Castello IM 13 2214 54541
Diano San Pietro IM 14 1145 55686
Andora SV 14 7552 63238
Laigueglia SV 16 1810 65048
Villa Faraldi IM 16 444 65492
Diano Arentino IM 17 722 66214
San Lorenzo al Mare IM 17 1297 67511
Pontedassio IM 18 2323 69834
Civezza IM 18 609 70443
Costarainera IM 18 828 71271
Cipressa IM 19 1290 72561
Dolcedo IM 19 1415 73976
Alassio SV 20 10934 84910

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km E of Sanremo (54807 inhabitants)
59 Km SW of Savona (61345 inhabitants)
80 Km SE of Cuneo (56081 inhabitants)
89 Km SW of Genova (586655 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 1.7 2018-09-19
10:20:26		 43.8312 8.1692 0 2022-06-28
16:27:53		 Bollettino Sismico Italiano INGV 106585821
Bulletin
Rev1000 		ML 1.8 2018-09-19
10:20:28		 43.932 8.1987 10 2019-06-04
09:15:56		 Bollettino Sismico Italiano INGV 61765321
Reviewed
Rev100 		ML 1.6 2018-09-19
10:20:26		 43.841 8.1648 0 2018-09-19
10:51:35		 Sala Sismica INGV-Roma 61102221
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-09-19 10:20:26 ± 0.25
Latitude 43.8312 ± 0.0162
Longitude 8.1692 ± 0.0112
Depth (km) 0 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type explosion
Origin ID 106585821

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1870
Semi-minor axis of confidence ellipse (meter) 860
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 12
Circular confidence region, given by single value of horizontal uncertainty (meter) 1870.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 229
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.37951
Epicentral distance of station farthest from the epicenter (degree) 2.05405
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 17
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 61102221
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-09-19 10:51:35

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 106585821
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-06-28 16:22:45

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 61765321
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2018-10-09 09:06:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.SATI.HHN. 2018-09-19T10:21:03.38 0.6 undecidable manual P 354 228.0051 38 0.1 27
GU.LSD.HHN. 2018-09-19T10:20:59.05 0.6 undecidable manual P 336 198.2571 38 -0.53 29
MN.BNI.HHN. 2018-09-19T10:20:57.74 0.6 undecidable manual P 319 179.6868 50 0.66 30
GU.SARM.EHN. 2018-09-19T10:20:56.88 0.6 undecidable manual P 77 182.2842 50 -0.61 31
MN.VLC.HHZ. 2018-09-19T10:20:56.79 0.6 undecidable manual P 78 180.6858 50 -0.44 33
GU.RSP.HNN. 2018-09-19T10:20:54.32 0.3 undecidable manual P 334 162.7149 50 -0.14 57
GU.EQUI.HHZ. 2018-09-19T10:20:54.33 0.6 undecidable manual P 76 162.615 50 -0.12 38
GU.BHB.HHN. 2018-09-19T10:20:50.08 0.1 undecidable manual P 327 132.5673 50 0.25 82
GU.GORR.HHE. 2018-09-19T10:20:48.75 0.6 undecidable manual P 46 124.0869 50 0.25 42
IV.MSSA.HHZ. 2018-09-19T10:20:48.32 0.3 undecidable manual P 63 120.1908 50 0.41 61
GU.PZZ.HHN. 2018-09-19T10:20:46.82 0.3 undecidable manual P 312 112.3986 50 0.11 66
GU.RNCA.HHE. 2018-09-19T10:20:44.42 0.3 undecidable manual P 41 94.4388 50 0.48 63
GU.PCP.HHE. 2018-09-19T10:20:42.11 0.3 undecidable manual P 21 84.249 50 -0.27 67
GU.ENR.HHN. 2018-09-19T10:20:40.71 0.3 undecidable manual P 307 74.4699 50 -0.15 71
IV.QLNO.HHE. 2018-09-19T10:20:37.55 0.3 undecidable manual P 14 56.499 90 -0.33 70
GU.GBOS.HHE. 2018-09-19T10:20:36.85 0.3 undecidable manual P 330 52.6029 90 -0.24 72
GU.CANO.HHZ. 2018-09-19T10:20:35.14 0.1 positive manual P 7 42.1245 90 0.14 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
MN.VLC.HNE. ML:2.3 0.000081300595 0.9408 AML other m 2018-09-19T10:20:58.76
GU.RNCA.HHE. ML:1.6 0.00004215 0.58 AML other m 2018-09-19T10:21:00.94
GU.RNCA.HHN. ML:1.6 0.00004565 0.86 AML other m 2018-09-19T10:21:01.06
IV.MSSA.HHN. ML:1.5 0.00002595 0.82 AML other m 2018-09-19T10:21:09.46
IV.MSSA.HHE. ML:1.7 0.00003877593 0.7424 AML other m 2018-09-19T10:21:14.17
MN.VLC.HHN. ML:1.6 0.00001747332 0.8832 AML other m 2018-09-19T10:21:17.53
GU.EQUI.HHN. ML:2.0 0.00004041547 0.7552 AML other m 2018-09-19T10:21:28.47
GU.EQUI.HHE. ML:1.7 0.000017512419500000002 0.9216 AML other m 2018-09-19T10:21:29.56
MN.VLC.HNN. ML:2.4 0.00008682649 1.0432 AML other m 2018-09-19T10:21:31.62
MN.VLC.HHE. ML:1.6 0.000014597981 0.7808 AML other m 2018-09-19T10:21:31.88
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