Earthquake with magnitude of ML 0.9 on date 19-10-2021 and time 20:55:46 (Italy) in region Perinaldo (IM)

A magnitude ML 0.9 earthquake occured in region: Perinaldo (IM), on

  • 19-10-2021 18:55:46 (UTC)
  • 19-10-2021 20:55:46 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.871, 7.678 at 9 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
Perinaldo IM 1 870 870
Apricale IM 2 629 1499
Isolabona IM 3 679 2178
Dolceacqua IM 5 2074 4252
Bajardo IM 5 312 4564
Soldano IM 5 977 5541
Seborga IM 5 315 5856
San Biagio della Cima IM 6 1329 7185
Vallebona IM 6 1310 8495
Rocchetta Nervina IM 7 298 8793
Castel Vittorio IM 7 287 9080
Pigna IM 7 859 9939
Camporosso IM 7 5632 15571
Ceriana IM 8 1250 16821
Ospedaletti IM 8 3367 20188
Vallecrosia IM 9 6956 27144
Airole IM 10 407 27551
Bordighera IM 10 10469 38020
Sanremo IM 10 54807 92827
Ventimiglia IM 10 24310 117137
Olivetta San Michele IM 13 211 117348
Taggia IM 14 14116 131464
Badalucco IM 15 1136 132600
Montalto Ligure IM 15 377 132977
Castellaro IM 15 1256 134233
Triora IM 15 355 134588
Molini di Triora IM 16 617 135205
Riva Ligure IM 17 2910 138115
Pompeiana IM 17 823 138938
Terzorio IM 18 216 139154
Santo Stefano al Mare IM 18 2197 141351
Carpasio IM 18 168 141519
Pietrabruna IM 18 501 142020

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km NW of Sanremo (54807 inhabitants)
59 Km S of Cuneo (56081 inhabitants)
81 Km SW of Savona (61345 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web 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 2021-10-19
18:55:46
43.8708 7.6783 9 2021-10-19
19:04:55
Sala Sismica INGV-Roma 96769811
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-19 18:55:46 ± 0.11
Latitude 43.8708 ± 0.0045
Longitude 7.6783 ± 0.0062
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96769811

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 391
Semi-minor axis of confidence ellipse (meter) 390
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 146
Circular confidence region, given by single value of horizontal uncertainty (meter) 420
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 149
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.12411
Epicentral distance of station farthest from the epicenter (degree) 0.45146
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 6
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 96769811
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-19 19:04:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
GU.STV.HHZ. 2021-10-19T18:56:02.57 0.6 undecidable manual S 326 0.4515 50 -0.46 43
GU.STV.HHZ. 2021-10-19T18:55:56.55 1.0 undecidable manual P 326 0.4515 50 0.4 22
GU.ENR.HHZ. 2021-10-19T18:55:55.62 0.6 undecidable manual P 333 0.4038 50 0.28 45
GU.MGRO.HHZ. 2021-10-19T18:55:54.88 0.6 undecidable manual S 29 0.1952 113 -0.01 50
FR.SAOF.HHZ.00 2021-10-19T18:55:53.18 0.3 undecidable manual S 322 0.1466 119 -0.01 76
GU.IMI.HHZ. 2021-10-19T18:55:53.49 0.6 undecidable manual S 76 0.1601 117 -0.15 49
GU.BURY.HHZ. 2021-10-19T18:55:52.26 0.6 undecidable manual S 225 0.1241 123 -0.21 49
GU.MGRO.HHZ. 2021-10-19T18:55:51.61 1.0 positive manual P 29 0.1952 113 0.16 24
GU.BURY.HHZ. 2021-10-19T18:55:50.13 0.1 positive manual P 225 0.1241 123 0.09 100
FR.SAOF.HHZ.00 2021-10-19T18:55:50.52 0.3 negative manual P 322 0.1466 119 0.06 75
GU.IMI.HHZ. 2021-10-19T18:55:50.73 0.6 undecidable manual P 76 0.1601 117 0 51
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.BURY.HHN. ML:0.8 7.31E-5 0.08 AML other m 2021-10-19T18:55:52.38
GU.BURY.HHE. ML:0.7 4.805E-5 1.24 AML other m 2021-10-19T18:55:52.11
FR.SAOF.HHE.00 ML:0.7 5.01E-5 0.5 AML other m 2021-10-19T18:55:53.53
GU.IMI.HHE. ML:1.3 0.000178 0.08 AML other m 2021-10-19T18:55:53.66
GU.IMI.HHN. ML:1.2 0.0001445 0.26 AML other m 2021-10-19T18:55:53.72
FR.SAOF.HHN.00 ML:0.6 3.81E-5 1.04 AML other m 2021-10-19T18:55:54.89
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