Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 0.6 on date 24-02-2021 and time 16:37:27 (Italy) in region 1 km NW Cisano sul Neva (SV)

A magnitude ML 0.6 (quarry blast) earthquake occured in region: 1 km NW Cisano sul Neva (SV), on

  • 24-02-2021 15:37:27 (UTC)
  • 24-02-2021 16:37:27 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.0940, 8.1420 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Cisano sul Neva SV 1 2085 2085
Zuccarello SV 3 309 2394
Arnasco SV 3 645 3039
Balestrino SV 5 595 3634
Castelvecchio di Rocca Barbena SV 5 145 3779
Villanova d'Albenga SV 5 2657 6436
Erli SV 6 245 6681
Vendone SV 6 388 7069
Castelbianco SV 6 330 7399
Ortovero SV 6 1586 8985
Toirano SV 7 2644 11629
Ceriale SV 7 5561 17190
Garlenda SV 8 1254 18444
Albenga SV 8 24213 42657
Onzo SV 8 219 42876
Boissano SV 8 2492 45368
Borghetto Santo Spirito SV 8 4948 50316
Nasino SV 9 207 50523
Alassio SV 10 10934 61457
Casanova Lerrone SV 10 749 62206
Loano SV 10 11407 73613
Ranzo IM 11 557 74170
Aquila d'Arroscia IM 11 166 74336
Alto CN 11 128 74464
Bardineto SV 11 756 75220
Giustenice SV 12 977 76197
Stellanello SV 12 808 77005
Pietra Ligure SV 13 8992 85997
Testico SV 13 196 86193
Laigueglia SV 13 1810 88003
Borghetto d'Arroscia IM 13 456 88459
Tovo San Giacomo SV 14 2582 91041
Magliolo SV 14 974 92015
Villa Faraldi IM 15 444 92459
Garessio CN 15 3244 95703
Andora SV 15 7552 103255
Borgio Verezzi SV 15 2205 105460
Caprauna CN 15 104 105564
Vessalico IM 15 282 105846
Calizzano SV 16 1475 107321
Cesio IM 16 283 107604
Calice Ligure SV 18 1730 109334
Rialto SV 18 564 109898
Diano Arentino IM 18 722 110620
Chiusanico IM 18 607 111227
Armo IM 18 111 111338
Finale Ligure SV 18 11711 123049
Caravonica IM 18 282 123331
San Bartolomeo al Mare IM 19 3129 126460
Cervo IM 19 1187 127647
Pieve di Teco IM 19 1338 128985
Chiusavecchia IM 19 577 129562
Diano San Pietro IM 19 1145 130707
Ormea CN 19 1617 132324
Priola CN 20 701 133025
Diano Castello IM 20 2214 135239
Pontedassio IM 20 2323 137562
Lucinasco IM 20 272 137834

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km SW of Savona (61345 inhabitants)
42 Km NE of Sanremo (54807 inhabitants)
58 Km SE of Cuneo (56081 inhabitants)
72 Km W of Genova (586655 inhabitants)
90 Km S of Asti (76202 inhabitants)
99 Km SW 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 0.6 2021-02-24
15:37:27		 44.0937 8.1423 1 2021-07-12
16:55:17		 Bollettino Sismico Italiano INGV 92262141
Reviewed
Rev100 		ML 0.6 2021-02-24
15:37:27		 44.109 8.1152 6 2021-02-24
15:44:12		 Sala Sismica INGV-Roma 87454771
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-24 15:37:27 ± 0.33
Latitude 44.0937 ± 0.0216
Longitude 8.1423 ± 0.0263
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 92262141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2970
Semi-minor axis of confidence ellipse (meter) 1270
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 321
Circular confidence region, given by single value of horizontal uncertainty (meter) 2970.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 191
Number of associated phases, regardless of their use for origin computation 7
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.48
Epicentral distance of station closest to the epicenter (degree) 0.05756
Epicentral distance of station farthest from the epicenter (degree) 0.53240
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 92262141
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-07-05 10:31:12

ML:0.6

Field Value
Value 0.6
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 87454771
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-24 15:44:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.PCP.HHN. 2021-02-24T15:37:38.24 0.3 undecidable manual P 33 59.0964 90 -0.97 53
FR.SAOF.HHE.00 2021-02-24T15:37:36.66 0.3 undecidable manual P 256 48.5181 91 -0.42 67
GU.IMI.HHZ. 2021-02-24T15:37:33.20 0.1 undecidable manual P 224 28.4493 91 0.14 99
GU.GBOS.HHZ. 2021-02-24T15:37:33.07 0.3 undecidable manual P 304 29.1486 91 -0.14 74
IV.QLNO.HHZ. 2021-02-24T15:37:33.45 0.3 undecidable manual P 32 30.2475 91 0.01 76
GU.CANO.HHZ. 2021-02-24T15:37:30.85 0.1 undecidable manual P 31 14.6742 92 0.53 92
GU.RORO.HHE. 2021-02-24T15:37:28.91 0.1 undecidable manual P 289 6.3936 94 0.26 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.CANO.HHE. ML:0.8 0.000083736065 0.3072 AML other m 2021-02-24T15:37:33.43
GU.CANO.HHN. ML:0.8 0.00008735 0.24 AML other m 2021-02-24T15:37:33.84
GU.GBOS.HHN. ML:0.3 0.000010003904 0.1152 AML other m 2021-02-24T15:37:37.19
GU.GBOS.HHE. ML:0.3 0.0000085998445 0.1024 AML other m 2021-02-24T15:37:37.47
IV.QLNO.HHN. ML:0.3 0.00001206378 0.128 AML other m 2021-02-24T15:37:38.21
GU.IMI.HHE. ML:0.8 0.0000331198835 0.2432 AML other m 2021-02-24T15:37:38.49
GU.IMI.HHN. ML:1.0 0.000047503825 0.2816 AML other m 2021-02-24T15:37:38.82
IV.QLNO.HHE. ML:0.5 0.000013006749999999999 0.1536 AML other m 2021-02-24T15:37:39.65
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