Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 20-07-2015 and time 13:40:28 (UTC) in region Costa Ligure centro occidentale (Savona)

A magnitude ML 0.9 earthquake occured in region: Costa Ligure centro occidentale (Savona), on

  • 20-07-2015 13:40:28 (UTC)
  • 20-07-2015 15:40:28 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.1640, 8.5660 at 6 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
Noli SV 13 2736 2736
Bergeggi SV 14 1129 3865
Spotorno SV 14 3803 7668
Vado Ligure SV 16 8336 16004
Savona SV 17 61345 77349
Finale Ligure SV 18 11711 89060
Vezzi Portio SV 18 809 89869
Albissola Marina SV 19 5487 95356
Quiliano SV 19 7232 102588
Celle Ligure SV 20 5237 107825

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km SE of Savona (61345 inhabitants)
40 Km SW of Genova (586655 inhabitants)
73 Km NE of Sanremo (54807 inhabitants)
84 Km S of Alessandria (93943 inhabitants)
85 Km E of Cuneo (56081 inhabitants)
87 Km SE of Asti (76202 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 0.9 2015-07-20
13:40:28		 44.1638 8.5662 6 2015-07-20
13:54:33		 Sala Sismica INGV-Roma 20400091
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2015-07-20 13:40:28 ± 0.34
Latitude 44.1638 ± 0.0162
Longitude 8.5662 ± 0.0150
Depth (km) 6 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 20400091

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1785
Semi-minor axis of confidence ellipse (meter) 826
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 338
Circular confidence region, given by single value of horizontal uncertainty (meter) 1780.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 166
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.44
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.82378
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 3
Type of magnitude ML
Reference to an origin 20400091
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2015-07-20 13:54:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EUCT.HNZ. 2015-07-20T13:41:07.99 3.0 undecidable manual S 0.16 0
IV.NDIM.HNZ. 2015-07-20T13:40:58.95 3.0 negative manual Pn 0.01 0
GU.ENR.HHZ. 2015-07-20T13:40:56.92 0.6 undecidable manual S 275 91.4418 50 0.4 43
IV.MSSA.HHE. 2015-07-20T13:40:52.21 0.6 undecidable manual S 77 77.4669 50 -0.58 42
GU.MGRO.HHZ. 2015-07-20T13:40:48.52 0.6 undecidable manual S 258 61.8936 50 -0.11 49
IV.IMI.HHE. 2015-07-20T13:40:47.77 0.6 undecidable manual S 243 60.5949 50 -0.52 45
GU.GBOS.HHZ. 2015-07-20T13:40:46.63 0.6 undecidable manual S 279 58.3971 50 -1.08 35
GU.ENR.HHZ. 2015-07-20T13:40:45.35 0.1 undecidable manual P 275 91.4418 50 0.71 78
FR.SAOF.HHE. 2015-07-20T13:40:44.31 0.3 undecidable manual P 257 83.1501 50 0.94 54
IV.MSSA.HHE. 2015-07-20T13:40:42.67 0.3 undecidable manual P 77 77.4669 50 0.18 70
GU.PCP.HHZ. 2015-07-20T13:40:42.37 0.6 undecidable manual S 358 41.9247 97 -0.71 43
GU.RORO.HHZ. 2015-07-20T13:40:41.65 0.3 undecidable manual S 262 40.2264 98 -0.85 61
GU.MGRO.HHZ. 2015-07-20T13:40:40.09 0.1 undecidable manual P 258 61.8936 50 0 100
GU.GBOS.HHZ. 2015-07-20T13:40:39.60 0.3 undecidable manual P 279 58.3971 50 0.05 75
IV.IMI.HHE. 2015-07-20T13:40:39.88 0.3 undecidable manual P 243 60.5949 50 -0.01 75
IV.QLNO.HHZ. 2015-07-20T13:40:37.79 0.6 undecidable manual S 316 24.9528 102 0.51 48
GU.RORO.HHZ. 2015-07-20T13:40:36.40 0.3 undecidable manual P 262 40.2264 98 -0.15 76
GU.PCP.HHZ. 2015-07-20T13:40:36.66 0.1 undecidable manual P 358 41.9247 97 -0.22 99
IV.QLNO.HHZ. 2015-07-20T13:40:34.20 0.3 undecidable manual P 316 24.9528 102 0.66 68
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.GBOS.HHN. ML:0.8 0.00001635 0.14 AML other m 2015-07-20T13:40:48.60
GU.GBOS.HHE. ML:0.7 0.00001145 0.2 AML other m 2015-07-20T13:40:50.51
IV.QLNO.HHN. ML:0.8 0.00003535 0.96 AML other m 2015-07-20T13:40:37.89
IV.QLNO.HHE. ML:0.8 0.00003315 0.52 AML other m 2015-07-20T13:40:38.26
GU.RORO.HHE. ML:1.1 0.00004105 0.94 AML other m 2015-07-20T13:40:42.68
GU.RORO.HHN. ML:1.1 0.0000465 0.78 AML other m 2015-07-20T13:40:42.88
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