Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 1.7 on date 04-04-2023 and time 07:26:50 (UTC) in region 4 km SE Ottana (NU)

A magnitude ML 1.7 (quarry blast) earthquake occured in region: 4 km SE Ottana (NU), on

  • 04-04-2023 07:26:50 (UTC)
  • 04-04-2023 09:26:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 40.2020, 9.0630 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 8 875 3209
Sarule NU 9 1691 4900
Ollolai NU 11 1318 6218
Orani NU 11 2891 9109
Oniferi NU 12 898 10007
Orotelli NU 12 2054 12061
Gavoi NU 12 2695 14756
Sedilo OR 12 2144 16900
Noragugume NU 12 324 17224
Teti NU 13 677 17901
Dualchi NU 14 625 18526
Ovodda NU 14 1621 20147
Nughedu Santa Vittoria OR 14 489 20636
Lodine NU 15 348 20984
Bidonì OR 15 148 21132
Austis NU 15 828 21960
Sorradile OR 15 386 22346
Bolotana NU 17 2656 25002
Tiana NU 17 503 25505
Lei NU 17 516 26021
Soddì OR 18 115 26136
Silanus NU 18 2177 28313
Illorai SS 18 886 29199
Aidomaggiore OR 18 460 29659
Ardauli OR 18 874 30533
Tadasuni OR 18 152 30685
Neoneli OR 19 669 31354
Fonni NU 19 3970 35324
Mamoiada NU 19 2555 37879
Boroneddu OR 19 151 38030
Ortueri NU 19 1175 39205
Sorgono NU 20 1693 40898

Municipalities with at least 50000 inhabitants

An earthquake occurred to
72 Km SE of Sassari (127525 inhabitants)
89 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 1.7 2023-04-04
07:26:50		 40.2017 9.0632 1 2024-03-01
17:18:19		 Bollettino Sismico Italiano INGV 124157971
Reviewed
Rev100 		ML 1.7 2023-04-04
07:26:50		 40.2203 9.0832 6 2023-04-04
07:53:11		 Sala Sismica INGV-Roma 116057601
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-04 07:26:50 ± 0.11
Latitude 40.2017 ± 0.0054
Longitude 9.0632 ± 0.0118
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 124157971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1050
Semi-minor axis of confidence ellipse (meter) 600
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 281
Circular confidence region, given by single value of horizontal uncertainty (meter) 1050.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 155
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 7
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.16462
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 7
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 124157971
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-01-09 10:38:37

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 116057601
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-04 07:53:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2023-04-04T07:28:50.84 3.0 undecidable manual Sn -1.86 0
IV.FNVD.HHZ. 2023-04-04T07:28:49.54 3.0 undecidable manual Sn 0.03 0
GU.CARD.HHZ. 2023-04-04T07:28:49.54 3.0 undecidable manual Sg 6.92 0
IV.ALJA.HHZ. 2023-04-04T07:28:46.63 3.0 undecidable manual Sn -5.18 0
IV.MMO1.EHZ. 2023-04-04T07:28:44.01 3.0 undecidable manual Sn -3.63 0
IV.GUMA.HHZ. 2023-04-04T07:28:44.39 3.0 undecidable manual Sn -5.92 0
IV.CDRU.HHZ. 2023-04-04T07:28:09.10 3.0 undecidable manual Pn 4.55 0
IV.ZCCA.HHZ. 2023-04-04T07:28:09.18 3.0 undecidable manual Pg 9.62 0
IV.RNI2.HHZ. 2023-04-04T07:28:06.91 3.0 positive manual Pg 11.05 0
IV.GATE.HHZ. 2023-04-04T07:28:06.12 3.0 negative manual Pn 3.59 0
IV.SGG.HHZ. 2023-04-04T07:27:59.58 3.0 positive manual Pn 2.8 0
IV.PAOL.HHZ. 2023-04-04T07:27:57.50 3.0 undecidable manual Pn -0.13 0
IV.CSNT.HHZ. 2023-04-04T07:27:54.70 3.0 negative manual Pg 4.98 0
IV.MFNL.HHZ. 2023-04-04T07:27:53.38 3.0 positive manual Pn 1.96 0
IV.POFI.HNZ. 2023-04-04T07:27:49.74 3.0 undecidable manual Pn -1.96 0
IV.RIBO.EHZ. 2023-04-04T07:27:42.90 3.0 positive manual Pn 0.68 0
TV.SU26.HHZ. 2023-04-04T07:27:13.25 0.3 undecidable manual P 202 129.2706 50 0.29 60
IV.AGLI.HHZ. 2023-04-04T07:27:08.61 0.3 undecidable manual P 5 103.0191 50 -0.31 63
IV.CGL.HHZ. 2023-04-04T07:27:07.64 0.1 positive manual P 168 94.8384 50 -0.01 90
MN.VSL.HHZ. 2023-04-04T07:27:05.53 0.3 undecidable manual P 161 82.7505 50 -0.26 66
IV.DGI.HHZ. 2023-04-04T07:26:59.90 0.1 positive manual P 74 47.8188 91 0.06 98
MN.SENA.HHZ. 2023-04-04T07:26:58.92 0.1 positive manual P 51 42.8238 91 0.08 98
IV.BULT.EHZ. 2023-04-04T07:26:57.19 0.1 positive manual P 357 34.1436 91 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BULT.EHE. ML:1.3 0.000087701995 0.2208 AML other m 2023-04-04T07:27:01.86
IV.BULT.EHN. ML:1.2 0.00007479411499999999 1.2 AML other m 2023-04-04T07:27:02.80
MN.SENA.HHE. ML:2.0 0.000308516 0.2208 AML other m 2023-04-04T07:27:04.00
MN.SENA.HHN. ML:2.1 0.00045345723 0.9824 AML other m 2023-04-04T07:27:05.02
IV.DGI.HNE. ML:1.4 0.00007130934999999999 0.6688 AML other m 2023-04-04T07:27:05.32
IV.DGI.HNN. ML:1.7 0.00013933835 1.2576 AML other m 2023-04-04T07:27:07.31
MN.VSL.HHN. ML:2.0 0.00012314999999999998 0.14 AML other m 2023-04-04T07:27:19.42
MN.VSL.HHE. ML:2.1 0.000154 0.14 AML other m 2023-04-04T07:27:19.50
IV.AGLI.HHN. ML:1.5 0.000030372629999999997 0.6368 AML other m 2023-04-04T07:27:21.24
IV.CGL.HHN. ML:1.8 0.00007541686999999999 1.52 AML other m 2023-04-04T07:27:22.08
IV.CGL.HHE. ML:1.8 0.00007648808 1.6 AML other m 2023-04-04T07:27:23.20
IV.AGLI.HHE. ML:1.6 0.0000388774455 0.656 AML other m 2023-04-04T07:27:24.61
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