Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 18-04-2019 and time 06:58:09 (UTC) in region Costa Ligure centro occidentale (Savona)

A magnitude ML 1.8 earthquake occured in region: Costa Ligure centro occidentale (Savona), on

  • 18-04-2019 06:58:09 (UTC)
  • 18-04-2019 08:58:09 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.8340, 8.3000 at 9 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
Cervo IM 18 1187 1187
Andora SV 19 7552 8739
San Bartolomeo al Mare IM 19 3129 11868
Diano Marina IM 19 5977 17845
Laigueglia SV 19 1810 19655

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km E of Sanremo (54807 inhabitants)
55 Km S of Savona (61345 inhabitants)
82 Km SW of Genova (586655 inhabitants)
86 Km SE of Cuneo (56081 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 1.8 2019-04-18
06:58:09		 43.8337 8.2997 9 2019-08-22
08:25:13		 Bollettino Sismico Italiano INGV 71244691
Reviewed
Rev100 		ML 1.7 2019-04-18
06:58:10		 43.856 8.2832 6 2019-04-18
07:07:50		 Sala Sismica INGV-Roma 67703381
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-04-18 06:58:09 ± 0.25
Latitude 43.8337 ± 0.0135
Longitude 8.2997 ± 0.0137
Depth (km) 9 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 71244691

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1560
Semi-minor axis of confidence ellipse (meter) 920
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 335
Circular confidence region, given by single value of horizontal uncertainty (meter) 1560.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 204
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 18
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.53065
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 13
Type of magnitude ML
Reference to an origin 71244691
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-08-07 12:35:49

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 14
Type of magnitude ML
Reference to an origin 67703381
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-04-18 07:07:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MF5.EHZ. 2019-04-18T07:00:02.18 3.0 undecidable manual Sn -5.33 0
IV.PE3.EHZ. 2019-04-18T06:59:51.31 3.0 undecidable manual Sg 4.15 0
IV.PTRJ.HNZ. 2019-04-18T06:59:50.70 3.0 undecidable manual Pg 13.89 0
IV.CDRU.HHZ. 2019-04-18T06:59:46.55 3.0 undecidable manual Pn -3.61 0
TV.SF01.EHZ. 2019-04-18T06:59:37.42 3.0 undecidable manual Sg 0.39 0
IV.OVO.HHZ. 2019-04-18T06:59:37.90 3.0 positive manual Pn -1.81 0
IV.LPEL.HHZ. 2019-04-18T06:59:21.06 3.0 undecidable manual Pn -8.18 0
IV.FOSV.EHZ. 2019-04-18T06:59:13.87 3.0 undecidable manual Pg 3.98 0
GU.RRL.HHZ. 2019-04-18T06:58:38.76 0.3 undecidable manual P 316 169.8966 50 0.96 42
GU.BHB.HHZ. 2019-04-18T06:58:33.46 0.3 undecidable manual P 324 138.2616 50 0.54 56
GU.PZZ.HHZ. 2019-04-18T06:58:30.92 0.3 undecidable manual P 309 120.1908 50 0.78 53
FR.SAOF.HHZ.00 2019-04-18T06:58:29.05 0.3 undecidable manual S 286 61.9935 50 -0.32 69
GU.GBOS.HHZ. 2019-04-18T06:58:28.39 0.6 undecidable manual S 321 58.1973 50 0.03 50
IV.MSSA.HHZ. 2019-04-18T06:58:28.20 0.3 undecidable manual P 61 110.8002 50 -0.5 61
IV.QLNO.HHZ. 2019-04-18T06:58:27.46 0.3 undecidable manual S 4 54.501 50 0.09 74
GU.STV.HHZ. 2019-04-18T06:58:25.64 0.1 undecidable manual P 301 90.0432 50 0.14 91
GU.ENR.HHZ. 2019-04-18T06:58:24.78 0.3 undecidable manual P 302 82.5507 50 0.44 65
GU.PCP.HHZ. 2019-04-18T06:58:23.91 0.3 undecidable manual P 14 80.8635 50 -0.17 69
GU.RORO.HHZ. 2019-04-18T06:58:22.00 0.3 undecidable manual S 329 36.0417 50 -0.44 71
FR.SAOF.HHZ.00 2019-04-18T06:58:21.24 0.3 undecidable manual P 286 61.9935 50 0.06 73
IV.IMI.HHZ. 2019-04-18T06:58:21.39 0.3 undecidable manual S 285 33.6441 50 -0.39 72
GU.GBOS.HHZ. 2019-04-18T06:58:20.56 0.1 undecidable manual P 321 58.1973 50 -0.03 99
GU.BURY.HHZ. 2019-04-18T06:58:20.79 0.3 undecidable manual P 265 59.6958 50 -0.03 74
IV.QLNO.HHZ. 2019-04-18T06:58:20.07 0.1 undecidable manual P 4 54.501 50 0.05 99
GU.RORO.HHZ. 2019-04-18T06:58:17.00 0.1 undecidable manual P 329 36.0417 50 -0.18 100
IV.IMI.HHZ. 2019-04-18T06:58:16.48 0.3 undecidable manual P 285 33.6441 50 -0.31 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.IMI.HHN. ML:1.7 0.00021300000000000003 1.4 AML other m 2019-04-18T06:58:22.70
GU.RORO.HHN. ML:1.7 0.000213 0.12 AML other m 2019-04-18T06:58:22.64
GU.RORO.HHE. ML:1.9 0.0003095 0.54 AML other m 2019-04-18T06:58:22.65
GU.GBOS.HHE. ML:1.4 0.00005196242 0.1792 AML other m 2019-04-18T06:58:30.04
FR.SAOF.HHN.00 ML:1.7 0.00009309999999999999 0.58 AML other m 2019-04-18T06:58:30.59
GU.GBOS.HHN. ML:1.7 0.00011256378 0.2592 AML other m 2019-04-18T06:58:31.65
FR.SAOF.HHE.00 ML:1.7 0.00009825 0.5 AML other m 2019-04-18T06:58:31.68
GU.ENR.HHN. ML:2.1 0.0001585 0.9 AML other m 2019-04-18T06:58:37.71
GU.ENR.HHE. ML:2.0 0.0001175 0.6 AML other m 2019-04-18T06:58:37.72
GU.STV.HHN. ML:1.8 0.0000704 0.3 AML other m 2019-04-18T06:58:39.81
GU.STV.HHE. ML:1.8 0.00007625 1.68 AML other m 2019-04-18T06:58:40.95
GU.BHB.HHE. ML:1.7 0.000028702004999999998 0.1792 AML other m 2019-04-18T06:58:52.18
GU.BHB.HHN. ML:1.7 0.0000319613495 0.2432 AML other m 2019-04-18T06:58:53.02
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