Earthquake (quarry blast) with magnitude of ML 1.2 on date 31-07-2019 and time 16:20:49 (Italy) in region Costa Ligure centro occidentale (Savona)

A magnitude ML 1.2 (quarry blast) earthquake occured in region: Costa Ligure centro occidentale (Savona), on

  • 31-07-2019 14:20:49 (UTC)
  • 31-07-2019 16:20:49 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.23, 8.42 at 0 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Event type: quarry blast.

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
Spotorno SV 0 3803 3803
Noli SV 3 2736 6539
Bergeggi SV 3 1129 7668
Vado Ligure SV 5 8336 16004
Vezzi Portio SV 5 809 16813
Quiliano SV 7 7232 24045
Orco Feglino SV 8 890 24935
Finale Ligure SV 9 11711 36646
Savona SV 10 61345 97991
Calice Ligure SV 11 1730 99721
Rialto SV 12 564 100285
Borgio Verezzi SV 12 2205 102490
Mallare SV 12 1146 103636
Albissola Marina SV 13 5487 109123
Altare SV 13 2108 111231
Tovo San Giacomo SV 14 2582 113813
Albisola Superiore SV 14 10163 123976
Pietra Ligure SV 14 8992 132968
Magliolo SV 14 974 133942
Giustenice SV 15 977 134919
Celle Ligure SV 16 5237 140156
Bormida SV 16 387 140543
Pallare SV 16 923 141466
Loano SV 17 11407 152873
Carcare SV 18 5587 158460
Osiglia SV 19 444 158904
Varazze SV 19 13251 172155
Borghetto Santo Spirito SV 19 4948 177103
Boissano SV 19 2492 179595
Stella SV 20 3009 182604

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km SW of Savona (61345 inhabitants)
45 Km W of Genova (586655 inhabitants)
68 Km NE of Sanremo (54807 inhabitants)
72 Km E of Cuneo (56081 inhabitants)
77 Km S of Asti (76202 inhabitants)
78 Km S of Alessandria (93943 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 1.2 2019-07-31
14:20:49
44.23 8.42 1 2019-11-13
14:31:02
Bollettino Sismico Italiano INGV 72357201
Reviewed
Rev100
ML 1.1 2019-07-31
14:20:50
44.29 8.33 11 2019-07-31
14:29:12
Sala Sismica INGV-Roma 71061271
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-07-31 14:20:49 ± 0.23
Latitude 44.23 ± 0.02
Longitude 8.42 ± 0.02
Depth (km) 1 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type quarry blast
Origin ID 72357201

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2090
Semi-minor axis of confidence ellipse (meter) 1090
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 328
Circular confidence region, given by single value of horizontal uncertainty (meter) 2090
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 147
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.42
Epicentral distance of station closest to the epicenter (degree) 0.10972
Epicentral distance of station farthest from the epicenter (degree) 0.78781
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 72357201
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-09-13 08:12:44

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 71061271
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-07-31 14:29:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MSSA.HHE. 2019-07-31T14:21:06.58 0.3 undecidable manual P 83 0.7878 50 0.47 61
IV.IMI.HHN. 2019-07-31T14:21:00.49 0.3 undecidable manual P 230 0.4964 91 -0.42 66
GU.RNCA.HHZ. 2019-07-31T14:20:59.68 0.3 undecidable manual P 57 0.4479 91 -0.14 71
GU.GBOS.HHE. 2019-07-31T14:20:58.64 0.3 undecidable manual P 272 0.4182 91 -0.52 65
GU.PCP.HHZ. 2019-07-31T14:20:56.59 0.3 undecidable manual P 16 0.3238 91 -0.47 68
GU.RORO.HHZ. 2019-07-31T14:20:56.11 0.1 undecidable manual P 246 0.2815 91 -0.02 100
GU.CANO.HHZ. 2019-07-31T14:20:53.41 0.1 positive manual P 261 0.1349 92 0.54 92
IV.QLNO.HHZ. 2019-07-31T14:20:52.59 0.1 undecidable manual P 330 0.1097 92 0.28 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.QLNO.HHN. ML:0.9 0.00012716765 0.416 AML other m 2019-07-31T14:20:56.28
GU.CANO.HHE. ML:1.6 0.00042720745 0.3008 AML other m 2019-07-31T14:20:56.43
IV.QLNO.HHE. ML:1.4 0.00034894235 0.416 AML other m 2019-07-31T14:20:56.51
GU.CANO.HHN. ML:1.4 0.00032454815 0.32 AML other m 2019-07-31T14:20:56.73
GU.RORO.HHN. ML:1.1 6.6859545E-5 0.1792 AML other m 2019-07-31T14:21:00.44
GU.RORO.HHE. ML:1 5.568253E-5 0.2624 AML other m 2019-07-31T14:21:00.46
GU.PCP.HHE. ML:0.9 3.105108E-5 0.2368 AML other m 2019-07-31T14:21:01.23
GU.PCP.HHN. ML:1 3.804014E-5 0.3776 AML other m 2019-07-31T14:21:04.78
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