Earthquake with magnitude of ML 1.1 on date 04-08-2020 and time 20:37:00 (Italy) in region Costa Ligure centro occidentale (Savona)

A magnitude ML 1.1 earthquake occured in region: Costa Ligure centro occidentale (Savona), on

  • 04-08-2020 18:37:00 (UTC)
  • 04-08-2020 20:37:00 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.17, 8.49 at 10 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.

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 7 2736 2736
Spotorno SV 9 3803 6539
Bergeggi SV 10 1129 7668
Finale Ligure SV 12 11711 19379
Vado Ligure SV 12 8336 27715
Vezzi Portio SV 12 809 28524
Orco Feglino SV 15 890 29414
Borgio Verezzi SV 15 2205 31619
Quiliano SV 15 7232 38851
Savona SV 16 61345 100196
Calice Ligure SV 16 1730 101926
Pietra Ligure SV 17 8992 110918
Albissola Marina SV 18 5487 116405
Tovo San Giacomo SV 18 2582 118987
Rialto SV 18 564 119551
Loano SV 19 11407 130958
Albisola Superiore SV 19 10163 141121
Magliolo SV 19 974 142095
Giustenice SV 20 977 143072
Celle Ligure SV 20 5237 148309

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km S of Savona (61345 inhabitants)
44 Km SW of Genova (586655 inhabitants)
69 Km NE of Sanremo (54807 inhabitants)
79 Km E of Cuneo (56081 inhabitants)
83 Km S of Alessandria (93943 inhabitants)
84 Km S of Asti (76202 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.1 2020-08-04
18:37:00
44.17 8.49 10 2020-08-04
18:45:00
Sala Sismica INGV-Roma 81653181
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-04 18:37:00 ± 0.2
Latitude 44.17 ± 0.01
Longitude 8.49 ± 0.01
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 81653181

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1081
Semi-minor axis of confidence ellipse (meter) 584
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 318
Circular confidence region, given by single value of horizontal uncertainty (meter) 1080
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 192
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.18706
Epicentral distance of station farthest from the epicenter (degree) 0.77072
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 81653181
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-04 18:45:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.ENR.HHZ. 2020-08-04T18:37:26.59 0.6 undecidable manual S 275 0.7707 50 0.54 40
GU.GBOS.HHZ. 2020-08-04T18:37:17.00 0.3 undecidable manual S 279 0.473 50 -0.25 69
GU.ENR.HHZ. 2020-08-04T18:37:15.59 0.3 undecidable manual P 275 0.7707 50 0.33 64
GU.PCP.HHZ. 2020-08-04T18:37:14.07 0.3 undecidable manual S 6 0.3732 50 -0.22 71
GU.GBOS.HHZ. 2020-08-04T18:37:10.13 0.1 undecidable manual P 279 0.473 50 -0.05 96
IV.IMI.HHZ. 2020-08-04T18:37:10.56 0.3 undecidable manual P 239 0.5027 50 -0.12 70
GU.RNCA.HHE. 2020-08-04T18:37:09.81 0.6 undecidable manual P 47 0.4452 50 0.11 47
IV.QLNO.HHZ. 2020-08-04T18:37:08.79 0.6 undecidable manual S 326 0.1871 116 0.26 48
GU.PCP.HHZ. 2020-08-04T18:37:08.56 1.0 undecidable manual P 6 0.3732 50 0.09 24
GU.CANO.HHZ. 2020-08-04T18:37:08.30 0.6 undecidable manual S 282 0.1871 116 -0.23 49
GU.CANO.HHZ. 2020-08-04T18:37:05.04 0.1 undecidable manual P 282 0.1871 116 -0.1 100
IV.QLNO.HHZ. 2020-08-04T18:37:05.27 1.0 undecidable manual P 326 0.1871 116 0.13 25
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.CANO.HHE. ML:1.2 0.000121479235 0.3584 AML other m 2020-08-04T18:37:10.02
GU.CANO.HHN. ML:1.2 0.000108558255 0.3072 AML other m 2020-08-04T18:37:12.22
IV.QLNO.HHE. ML:1 7.465937E-5 0.2048 AML other m 2020-08-04T18:37:08.72
IV.QLNO.HHN. ML:0.9 5.4574791E-5 0.1408 AML other m 2020-08-04T18:37:09.10
GU.PCP.HHE. ML:0.8 1.992829E-5 0.2304 AML other m 2020-08-04T18:37:14.69
GU.GBOS.HHE. ML:1.1 3.1878405E-5 0.1024 AML other m 2020-08-04T18:37:18.60
GU.GBOS.HHN. ML:1.1 3.1218955E-5 0.2176 AML other m 2020-08-04T18:37:18.78
IV.IMI.HHN. ML:1.3 4.7929805E-5 0.2176 AML other m 2020-08-04T18:37:21.41
GU.ENR.HHE. ML:1.2 1.93672425E-5 0.0768 AML other m 2020-08-04T18:37:28.52
GU.ENR.HHN. ML:1.3 2.669549E-5 0.0768 AML other m 2020-08-04T18:37:28.14
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