Earthquake with magnitude of ML 0.9 on date 30-07-2020 and time 03:34:11 (UTC) in region Costa Ligure Occidentale (Imperia)

A magnitude ML 0.9 earthquake occured in region: Costa Ligure Occidentale (Imperia), on

  • 30-07-2020 03:34:11 (UTC)
  • 30-07-2020 05:34:11 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.03, 7.64 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Briga Alta CN 10 39 39
Triora IM 11 355 394
Pigna IM 11 859 1253
Molini di Triora IM 12 617 1870
Castel Vittorio IM 12 287 2157
Mendatica IM 14 185 2342
Montegrosso Pian Latte IM 15 118 2460
Bajardo IM 16 312 2772
Cosio d'Arroscia IM 16 221 2993
Rocchetta Nervina IM 16 298 3291
Apricale IM 17 629 3920
Isolabona IM 17 679 4599
Rezzo IM 19 366 4965
Perinaldo IM 19 870 5835
Pornassio IM 19 685 6520
Airole IM 19 407 6927
Limone Piemonte CN 20 1485 8412
Olivetta San Michele IM 20 211 8623
Carpasio IM 20 168 8791
Ceriana IM 20 1250 10041

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km NW of Sanremo (54807 inhabitants)
41 Km S of Cuneo (56081 inhabitants)
74 Km W of Savona (61345 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 0.9 2020-07-30
03:34:11
44.03 7.64 6 2020-07-30
03:41:08
Sala Sismica INGV-Roma 81473461
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-07-30 03:34:11 ± 0.1
Latitude 44.03 ± 0.01
Longitude 7.64 ± 0.01
Depth (km) 6 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 81473461

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 499
Semi-minor axis of confidence ellipse (meter) 446
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 171
Circular confidence region, given by single value of horizontal uncertainty (meter) 500
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
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) 0.08004
Epicentral distance of station farthest from the epicenter (degree) 0.84536
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 81473461
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-07-30 03:41:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.PZZ.HHZ. 2020-07-30T03:34:33.21 0.6 undecidable manual S 322 0.6043 50 -0.33 43
GU.BHB.HHZ. 2020-07-30T03:34:28.36 0.3 undecidable manual P 341 0.8454 50 -0.17 64
GU.PZZ.HHZ. 2020-07-30T03:34:24.78 0.1 undecidable manual P 322 0.6043 50 0.37 86
GU.RORO.HHZ. 2020-07-30T03:34:23.78 0.3 undecidable manual S 75 0.3148 99 -0.42 68
GU.ENR.HHZ. 2020-07-30T03:34:21.60 0.1 undecidable manual S 321 0.25 101 -0.17 96
GU.RORO.HHZ. 2020-07-30T03:34:18.78 0.1 undecidable manual P 75 0.3148 99 -0.24 94
GU.ENR.HHZ. 2020-07-30T03:34:17.79 0.1 undecidable manual P 321 0.25 101 0.18 96
GU.GBOS.HHE. 2020-07-30T03:34:17.82 0.1 undecidable manual P 34 0.2518 101 0.17 96
GU.MGRO.HHE. 2020-07-30T03:34:17.08 0.3 undecidable manual S 86 0.1196 113 0.15 74
GU.BURY.HHE. 2020-07-30T03:34:17.72 0.3 undecidable manual P 194 0.2581 101 -0.07 74
FR.SAOF.HHZ.00 2020-07-30T03:34:15.38 0.1 undecidable manual S 233 0.08 122 -0.18 99
GU.MGRO.HHE. 2020-07-30T03:34:15.08 0.1 undecidable manual P 86 0.1196 113 0.26 97
FR.SAOF.HHZ.00 2020-07-30T03:34:14.18 0.1 undecidable manual P 233 0.08 122 0.15 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
FR.SAOF.HHE.00 ML:0.9 0.00014632535 0.7008 AML other m 2020-07-30T03:34:17.20
FR.SAOF.HHN.00 ML:0.8 0.000117016405 0.56 AML other m 2020-07-30T03:34:18.60
GU.ENR.HHE. ML:0.4 1.7238785E-5 0.24 AML other m 2020-07-30T03:34:22.62
GU.ENR.HHN. ML:0.7 2.579024E-5 0.12 AML other m 2020-07-30T03:34:22.36
GU.RORO.HHE. ML:1.7 0.0002274231 2.5408 AML other m 2020-07-30T03:34:23.15
GU.RORO.HHN. ML:0.6 1.6968635E-5 0.12 AML other m 2020-07-30T03:34:24.22
GU.PZZ.HHE. ML:0.8 1.19833045E-5 1.4416 AML other m 2020-07-30T03:34:35.13
GU.PZZ.HHN. ML:0.9 1.256105E-5 2.8608 AML other m 2020-07-30T03:34:38.91
GU.BHB.HHE. ML:1.3 1.9429205E-5 2.7808 AML other m 2020-07-30T03:34:58.06
GU.BHB.HHN. ML:1.1 1.5111445E-5 2.9408 AML other m 2020-07-30T03:34:52.19
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