Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 1.1 on date 31-01-2018 and time 12:45:53 (Italy) in region 2 km SW Plodio (SV)

A magnitude ML 1.1 (quarry blast) earthquake occured in region: 2 km SW Plodio (SV), on

  • 31-01-2018 11:45:53 (UTC)
  • 31-01-2018 12:45:53 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 44.3500, 8.2290 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
Plodio SV 2 650 650
Cosseria SV 2 1105 1755
Millesimo SV 3 3383 5138
Roccavignale SV 3 752 5890
Pallare SV 4 923 6813
Cengio SV 5 3563 10376
Carcare SV 5 5587 15963
Murialdo SV 6 841 16804
Cairo Montenotte SV 7 13269 30073
Montezemolo CN 8 259 30332
Castelnuovo di Ceva CN 8 110 30442
Bormida SV 8 387 30829
Osiglia SV 8 444 31273
Mallare SV 9 1146 32419
Saliceto CN 9 1323 33742
Altare SV 9 2108 35850
Camerana CN 11 631 36481
Priero CN 11 529 37010
Perlo CN 12 116 37126
Sale delle Langhe CN 13 486 37612
Dego SV 13 1985 39597
Sale San Giovanni CN 13 183 39780
Gottasecca CN 13 148 39928
Nucetto CN 14 430 40358
Massimino SV 14 113 40471
Rialto SV 15 564 41035
Calizzano SV 16 1475 42510
Paroldo CN 16 211 42721
Bagnasco CN 16 1035 43756
Monesiglio CN 16 645 44401
Quiliano SV 16 7232 51633
Ceva CN 16 5782 57415
Castelletto Uzzone CN 16 331 57746
Orco Feglino SV 16 890 58636
Piana Crixia SV 16 788 59424
Calice Ligure SV 17 1730 61154
Prunetto CN 17 451 61605
Vezzi Portio SV 17 809 62414
Giusvalla SV 17 441 62855
Mombarcaro CN 17 268 63123
Magliolo SV 18 974 64097
Battifollo CN 18 219 64316
Torresina CN 18 52 64368
Roascio CN 18 97 64465
Vado Ligure SV 19 8336 72801
Bardineto SV 19 756 73557
Scagnello CN 19 194 73751
Tovo San Giacomo SV 19 2582 76333
Merana AL 20 189 76522
Gorzegno CN 20 304 76826
Pontinvrea SV 20 847 77673
Giustenice SV 20 977 78650
Priola CN 20 701 79351

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km W of Savona (61345 inhabitants)
54 Km E of Cuneo (56081 inhabitants)
57 Km W of Genova (586655 inhabitants)
61 Km S of Asti (76202 inhabitants)
69 Km NE of Sanremo (54807 inhabitants)
70 Km SW of Alessandria (93943 inhabitants)
84 Km SE of Moncalieri (57294 inhabitants)
91 Km SE of Torino (890529 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 1.1 2018-01-31
11:45:53		 44.3498 8.2287 1 2019-04-24
14:49:30		 Bollettino Sismico Italiano INGV 56368871
Reviewed
Rev100 		ML 1.3 2018-01-31
11:45:53		 44.3342 8.261 10 2018-01-31
11:55:59		 Sala Sismica INGV-Roma 53577571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-01-31 11:45:53 ± 0.12
Latitude 44.3498 ± 0.0081
Longitude 8.2287 ± 0.0088
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 56368871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1000
Semi-minor axis of confidence ellipse (meter) 570
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 330
Circular confidence region, given by single value of horizontal uncertainty (meter) 1000.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 161
Number of associated phases, regardless of their use for origin computation 5
Number of defining phases 5
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.08723
Epicentral distance of station farthest from the epicenter (degree) 0.29857
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.4
Num. used stations 3
Type of magnitude ML
Reference to an origin 56368871
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-01-28 22:40:42

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 53577571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-01-31 11:55:59
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.GBOS.HHZ. 2018-01-31T11:46:00.44 0.1 undecidable manual P 249 33.1446 91 0.13 95
GU.PCP.HHZ. 2018-01-31T11:46:00.15 0.3 undecidable manual P 50 32.8449 91 -0.1 72
GU.RORO.HHZ. 2018-01-31T11:45:59.36 0.1 undecidable manual P 206 29.3484 91 -0.2 95
GU.CANO.HHZ. 2018-01-31T11:45:56.89 0.1 positive manual P 178 15.7731 92 0.05 100
IV.QLNO.HHZ. 2018-01-31T11:45:55.72 0.1 positive manual P 107 9.6792 93 0.09 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
GU.CANO.HHE. ML:1.2 0.00015809040000000003 0.1792 AML other m 2018-01-31T11:45:59.19
GU.CANO.HHN. ML:1.3 0.000225 0.2 AML other m 2018-01-31T11:45:59.29
GU.GBOS.HHN. ML:0.3 0.0000085543395 0.16 AML other m 2018-01-31T11:46:05.20
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