Earthquake with magnitude of ML 1.5 on date 26-10-2020 and time 18:06:01 (Italy) in region Costa Ligure Occidentale (Imperia)

A magnitude ML 1.5 earthquake occured in region: Costa Ligure Occidentale (Imperia), on

  • 26-10-2020 17:06:01 (UTC)
  • 26-10-2020 18:06:01 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.79, 7.94 at 11 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
Santo Stefano al Mare IM 6 2197 2197
Riva Ligure IM 7 2910 5107
Cipressa IM 7 1290 6397
Costarainera IM 7 828 7225
San Lorenzo al Mare IM 8 1297 8522
Terzorio IM 8 216 8738
Pompeiana IM 8 823 9561
Taggia IM 9 14116 23677
Castellaro IM 10 1256 24933
Civezza IM 10 609 25542
Pietrabruna IM 12 501 26043
Sanremo IM 13 54807 80850
Imperia IM 13 42034 122884
Dolcedo IM 13 1415 124299
PrelĂ  IM 15 503 124802
Badalucco IM 16 1136 125938
Vasia IM 16 389 126327
Ceriana IM 17 1250 127577
Montalto Ligure IM 17 377 127954
Ospedaletti IM 17 3367 131321
Diano Marina IM 18 5977 137298
Pontedassio IM 18 2323 139621
Diano Castello IM 18 2214 141835
Diano San Pietro IM 19 1145 142980
Diano Arentino IM 20 722 143702
Seborga IM 20 315 144017
Carpasio IM 20 168 144185
Lucinasco IM 20 272 144457

Municipalities with at least 50000 inhabitants

An earthquake occurred to
13 Km E of Sanremo (54807 inhabitants)
72 Km SW of Savona (61345 inhabitants)
74 Km SE of Cuneo (56081 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 1.5 2020-10-26
17:06:01
43.79 7.94 11 2020-10-26
17:11:34
Sala Sismica INGV-Roma 84160311
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-26 17:06:01 ± 0.25
Latitude 43.79 ± 0.01
Longitude 7.94 ± 0.01
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 84160311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1290
Semi-minor axis of confidence ellipse (meter) 164
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 327
Circular confidence region, given by single value of horizontal uncertainty (meter) 1290
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 242
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
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) 0.12411
Epicentral distance of station farthest from the epicenter (degree) 1.15023
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:1.5

Field Value
Value 1.5
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 84160311
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-26 17:11:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.BHB.HHZ. 2020-10-26T17:06:37.47 0.6 undecidable manual S 336 1.1502 50 -0.07 41
GU.STV.HHZ. 2020-10-26T17:06:22.27 0.6 undecidable manual S 316 0.6313 50 0.09 46
GU.BHB.HHZ. 2020-10-26T17:06:22.50 0.1 undecidable manual P 336 1.1502 50 0.4 76
GU.ENR.HHZ. 2020-10-26T17:06:20.64 0.6 undecidable manual S 320 0.572 50 0.22 45
GU.CANO.HHZ. 2020-10-26T17:06:17.52 0.3 undecidable manual S 27 0.4703 50 0.12 71
GU.GBOS.HHZ. 2020-10-26T17:06:16.97 0.6 undecidable manual S 351 0.4569 50 -0.02 48
GU.STV.HHZ. 2020-10-26T17:06:13.35 0.1 undecidable manual P 316 0.6313 50 0.12 91
GU.RORO.HHZ. 2020-10-26T17:06:12.89 0.6 undecidable manual S 16 0.3354 50 -0.51 44
GU.ENR.HHZ. 2020-10-26T17:06:12.18 1.0 undecidable manual P 320 0.572 50 -0.03 23
GU.BURY.HHE. 2020-10-26T17:06:11.20 0.6 undecidable manual S 269 0.2734 50 -0.36 47
GU.GBOS.HHZ. 2020-10-26T17:06:10.06 0.1 undecidable manual P 351 0.4569 50 -0.17 93
GU.CANO.HHZ. 2020-10-26T17:06:10.92 0.1 undecidable manual P 27 0.4703 50 0.46 88
GU.RORO.HHZ. 2020-10-26T17:06:07.72 0.1 undecidable manual P 16 0.3354 50 -0.44 90
IV.IMI.HHZ. 2020-10-26T17:06:07.16 0.6 undecidable manual S 346 0.1241 129 0.03 51
GU.BURY.HHE. 2020-10-26T17:06:07.11 0.1 undecidable manual P 269 0.2734 50 0.01 100
IV.IMI.HHZ. 2020-10-26T17:06:04.15 1.0 undecidable manual P 346 0.1241 129 -0.39 24
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.IMI.HHE. ML:1.5 0.00031094645 0.0896 AML other m 2020-10-26T17:06:07.30
IV.IMI.HHN. ML:1.8 0.00056901785 0.0896 AML other m 2020-10-26T17:06:07.35
GU.RORO.HHN. ML:1.6 0.000138941995 0.0896 AML other m 2020-10-26T17:06:16.28
GU.GBOS.HHE. ML:1.3 5.0261154E-5 0.256 AML other m 2020-10-26T17:06:17.53
GU.ENR.HHE. ML:1.4 5.1250935E-5 0.064 AML other m 2020-10-26T17:06:24.84
GU.ENR.HHN. ML:1.6 7.478829E-5 0.1024 AML other m 2020-10-26T17:06:23.81
GU.STV.HHE. ML:1.5 5.627467E-5 0.128 AML other m 2020-10-26T17:06:24.65
GU.STV.HHN. ML:1.6 6.3204295E-5 0.1408 AML other m 2020-10-26T17:06:25.35
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