Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 1.5 on date 30-08-2021 and time 07:17:18 (UTC) in region 4 km SE Ottana (NU)

A magnitude ML 1.5 (quarry blast) earthquake occured in region: 4 km SE Ottana (NU), on

  • 30-08-2021 07:17:18 (UTC)
  • 30-08-2021 09:17:18 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 40.2050, 9.0710 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
Ottana NU 4 2334 2334
Olzai NU 7 875 3209
Sarule NU 9 1691 4900
Ollolai NU 10 1318 6218
Orani NU 11 2891 9109
Oniferi NU 11 898 10007
Orotelli NU 12 2054 12061
Gavoi NU 12 2695 14756
Teti NU 13 677 15433
Noragugume NU 13 324 15757
Sedilo OR 13 2144 17901
Lodine NU 14 348 18249
Ovodda NU 14 1621 19870
Dualchi NU 15 625 20495
Austis NU 15 828 21323
Nughedu Santa Vittoria OR 15 489 21812
Bidonì OR 15 148 21960
Sorradile OR 16 386 22346
Tiana NU 17 503 22849
Bolotana NU 17 2656 25505
Lei NU 17 516 26021
Illorai SS 18 886 26907
Fonni NU 18 3970 30877
Silanus NU 18 2177 33054
Mamoiada NU 18 2555 35609
Soddì OR 18 115 35724
Aidomaggiore OR 19 460 36184
Ardauli OR 19 874 37058
Tadasuni OR 19 152 37210
Neoneli OR 19 669 37879
Boroneddu OR 20 151 38030
Sorgono NU 20 1693 39723
Ortueri NU 20 1175 40898

Municipalities with at least 50000 inhabitants

An earthquake occurred to
72 Km SE of Sassari (127525 inhabitants)
88 Km SW of Olbia (59368 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 1.5 2021-08-30
07:17:18		 40.2048 9.0708 1 2021-12-29
11:12:29		 Bollettino Sismico Italiano INGV 95260791
Reviewed
Rev100 		ML 1.4 2021-08-30
07:17:18		 40.2472 9.0862 10 2021-08-30
07:26:48		 Sala Sismica INGV-Roma 94812011
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-30 07:17:18 ± 0.23
Latitude 40.2048 ± 0.0126
Longitude 9.0708 ± 0.0236
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 95260791

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1970
Semi-minor axis of confidence ellipse (meter) 1390
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 278
Circular confidence region, given by single value of horizontal uncertainty (meter) 1970.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 153
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.39
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.89487
Number of stations at which the event was observed 31
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 95260791
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-14 16:00:02

ML:1.4

Field Value
Value 1.4
Uncertainty 0.4
Num. used stations 8
Type of magnitude ML
Reference to an origin 94812011
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-30 07:26:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IT.FIE.HGZ. 2021-08-30T07:19:16.39 3.0 undecidable manual Sg 5.34 0
GU.CANO.HHZ. 2021-08-30T07:19:16.66 3.0 undecidable manual Sg 3.64 0
IV.TERO.HHZ. 2021-08-30T07:19:13.81 3.0 undecidable manual Sn -3.32 0
IV.ZCCA.HHZ. 2021-08-30T07:19:11.40 3.0 undecidable manual Sn -9.7 0
IV.GIZZ.HHZ. 2021-08-30T07:18:56.27 3.0 positive manual Pg 7.69 0
IV.BRMO.HHZ. 2021-08-30T07:18:56.05 3.0 undecidable manual Pn -0.25 0
IX.SCL3.EHZ.02 2021-08-30T07:18:50.50 3.0 undecidable manual Pg 12.15 0
MN.VAE.HHZ. 2021-08-30T07:18:48.16 3.0 undecidable manual Pg 8.72 0
IV.MGR.HHZ. 2021-08-30T07:18:46.75 3.0 undecidable manual Pg 7.84 0
IV.ZEN8.EHZ. 2021-08-30T07:18:44.56 3.0 undecidable manual Pn -1.12 0
IV.CELB.HHZ. 2021-08-30T07:18:43.74 3.0 undecidable manual Sg 4.09 0
IV.CADC.EHZ. 2021-08-30T07:18:41.15 3.0 positive manual Pn -0.95 0
IV.IACL.HHZ. 2021-08-30T07:18:35.80 3.0 negative manual Pg 3.84 0
IV.NDIM.HNZ. 2021-08-30T07:18:33.53 3.0 positive manual Pn -2.64 0
GU.MGRO.HHZ. 2021-08-30T07:18:31.66 3.0 negative manual Pg 8.11 0
IV.TST02.HHZ. 2021-08-30T07:18:30.15 3.0 undecidable manual Pn -0.04 0
GU.CANO.HHZ. 2021-08-30T07:18:29.27 3.0 positive manual Pg 4.39 0
IV.CMPR.HHZ. 2021-08-30T07:18:27.56 3.0 undecidable manual Pn -8.58 0
IV.OVO.HHZ. 2021-08-30T07:18:26.93 3.0 positive manual Pn 0.09 0
IV.VVLD.HHZ. 2021-08-30T07:18:23.45 3.0 negative manual Pg 0.92 0
IV.PII.HHZ. 2021-08-30T07:18:21.58 3.0 negative manual Pg 1.77 0
IV.RMP.HHZ. 2021-08-30T07:18:15.75 3.0 negative manual Pg 2.1 0
IV.CSNT.HHZ. 2021-08-30T07:18:15.65 3.0 undecidable manual Pn -4.03 0
IV.TOLF.HHZ. 2021-08-30T07:18:09.57 3.0 negative manual Pg 0.17 0
IV.LAV9.HNZ. 2021-08-30T07:18:06.12 3.0 positive manual Pn -6.66 0
FR.SMPL.HHE.00 2021-08-30T07:17:53.78 0.3 undecidable manual P 5 210.3339 38 1.18 30
TV.SU26.HHZ. 2021-08-30T07:17:41.18 0.3 undecidable manual P 203 129.87 50 0.25 60
IV.AGLI.HHZ. 2021-08-30T07:17:36.36 0.1 undecidable manual P 5 102.6195 50 -0.38 82
MN.VSL.HHZ. 2021-08-30T07:17:33.35 0.3 undecidable manual P 162 82.8504 50 -0.34 65
IV.DGI.HHZ. 2021-08-30T07:17:27.65 0.1 positive manual P 74 47.0196 91 0.07 98
IV.SENA.HHZ. 2021-08-30T07:17:26.61 0.1 positive manual P 51 42.0246 91 0.03 99
IV.BULT.EHZ. 2021-08-30T07:17:24.86 0.1 undecidable manual P 356 33.8439 91 -0.07 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BULT.EHE. ML:1.1 0.00005467695 0.1792 AML other m 2021-08-30T07:17:29.68
IV.BULT.EHN. ML:0.8 0.0000307772 0.1024 AML other m 2021-08-30T07:17:30.15
IV.SENA.HHE. ML:1.7 0.00017095855 1.6384 AML other m 2021-08-30T07:17:33.16
IV.SENA.HHN. ML:1.8 0.0001996577 0.7584 AML other m 2021-08-30T07:17:33.44
IV.DGI.HNN. ML:1.1 0.000040284199999999996 2.5824 AML other m 2021-08-30T07:17:34.70
IV.DGI.HHE. ML:0.8 0.00001776229 2.1376 AML other m 2021-08-30T07:17:33.73
MN.VSL.HHE. ML:1.6 0.00005424999999999999 0.46 AML other m 2021-08-30T07:17:47.10
MN.VSL.HHN. ML:1.7 0.00006104999999999999 0.14 AML other m 2021-08-30T07:17:47.32
TV.SU26.HHN. ML:1.8 0.000042871649999999995 0.496 AML other m 2021-08-30T07:17:57.96
TV.SU26.HHE. ML:1.9 0.000050797085 0.112 AML other m 2021-08-30T07:17:59.64
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