Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 1.8 on date 27-04-2023 and time 09:34:23 (UTC) in region 6 km SE Orroli (CA)

A magnitude ML 1.8 (quarry blast) earthquake occured in region: 6 km SE Orroli (CA), on

  • 27-04-2023 09:34:23 (UTC)
  • 27-04-2023 11:34:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 39.6660, 9.3070 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Orroli CA 6 2298 2298
Escalaplano CA 6 2201 4499
Nurri CA 8 2184 6683
Goni CA 10 492 7175
Perdasdefogu OG 12 1957 9132
Siurgus Donigala CA 13 2028 11160
Esterzili CA 13 668 11828
Ballao CA 14 831 12659
Serri CA 14 660 13319
Villanova Tulo CA 15 1108 14427
Mandas CA 15 2201 16628
Escolca CA 16 594 17222
Silius CA 17 1202 18424
Sadali CA 17 971 19395
San Basilio CA 17 1251 20646
Armungia CA 17 481 21127
Ussassai OG 18 575 21702
Gergei CA 18 1236 22938
Gesico CA 18 849 23787
Suelli CA 19 1127 24914
San Nicolò Gerrei CA 19 788 25702
Isili CA 19 2741 28443
Seui OG 19 1310 29753

Municipalities with at least 50000 inhabitants

An earthquake occurred to
48 Km N of Quartu Sant'Elena (71125 inhabitants)
53 Km NE of Cagliari (154460 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 1.8 2023-04-27
09:34:23		 39.6665 9.3068 1 2024-03-01
17:18:06		 Bollettino Sismico Italiano INGV 117139741
Reviewed
Rev100 		ML 1.8 2023-04-27
09:34:23		 39.6253 9.4298 10 2023-04-27
15:54:46		 Sala Sismica INGV-Roma 116805621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-27 09:34:23 ± 0.16
Latitude 39.6665 ± 0.0099
Longitude 9.3068 ± 0.0339
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 117139741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2980
Semi-minor axis of confidence ellipse (meter) 930
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 280
Circular confidence region, given by single value of horizontal uncertainty (meter) 2980.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 163
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 1.46320
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 6
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 117139741
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-01-29 14:42:21

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 116805621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-27 15:54:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.RORO.HHZ. 2023-04-27T09:36:23.04 3.0 undecidable manual Sn -3.06 0
IV.RIBO.EHZ.01 2023-04-27T09:36:15.98 3.0 undecidable manual Sg 14.09 0
IV.BRES.EHZ. 2023-04-27T09:36:14.16 3.0 undecidable manual Pn 4.81 0
IV.RNI2.HHZ. 2023-04-27T09:36:13.60 3.0 undecidable manual Sn -5.56 0
NI.VINO.HHZ. 2023-04-27T09:36:11.13 3.0 positive manual Pn 2.38 0
OX.MPRI.HHZ. 2023-04-27T09:36:05.34 3.0 undecidable manual Pn -2.09 0
IV.SRES.HHZ. 2023-04-27T09:36:03.96 3.0 undecidable manual Sn 1.68 0
IV.MAGA.HHZ. 2023-04-27T09:36:01.10 3.0 negative manual Pn 6.43 0
IV.CROCE.HNZ. 2023-04-27T09:35:53.08 3.0 undecidable manual Pg 13.69 0
IV.MRLC.HHZ. 2023-04-27T09:35:52.87 3.0 positive manual Pg 15.68 0
IV.TDS.HHZ. 2023-04-27T09:35:44.60 3.0 undecidable manual Pn -0.55 0
IV.NARO.HHZ. 2023-04-27T09:35:41.85 3.0 undecidable manual Pg 8.11 0
7C.SPAOL.HNZ. 2023-04-27T09:35:40.11 3.0 negative manual Pn 0.86 0
IV.PLLN.EHZ. 2023-04-27T09:35:39.00 3.0 positive manual Pg 11.53 0
IV.CESI.HHZ. 2023-04-27T09:35:29.30 3.0 positive manual Pn 0.23 0
IV.CMDO.HHZ. 2023-04-27T09:35:25.12 3.0 positive manual Pn -2.89 0
IV.AGLI.HHZ. 2023-04-27T09:34:51.36 0.1 undecidable manual P 356 162.4152 50 0.51 69
IV.BULT.EHE. 2023-04-27T09:34:40.68 0.1 undecidable manual P 346 96.2259 50 0.04 91
TV.SU26.HHZ. 2023-04-27T09:34:39.86 0.1 undecidable manual P 230 92.3409 50 -0.19 88
MN.SENA.HHZ. 2023-04-27T09:34:39.13 0.1 positive manual P 8 87.246 50 -0.13 90
IV.DGI.HHZ. 2023-04-27T09:34:37.37 0.1 positive manual P 19 76.6677 50 -0.26 90
IV.CGL.HHZ. 2023-04-27T09:34:29.85 0.1 positive manual P 182 33.3444 91 0.13 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CGL.HHN. ML:1.7 0.000237 0.24 AML other m 2023-04-27T09:34:36.13
IV.CGL.HHE. ML:1.7 0.000246 0.3 AML other m 2023-04-27T09:34:36.28
IV.DGI.HHN. ML:1.7 0.00008195 1.82 AML other m 2023-04-27T09:34:52.96
IV.DGI.HHE. ML:1.7 0.0000769 0.76 AML other m 2023-04-27T09:34:52.70
MN.SENA.HHN. ML:1.7 0.00006634999999999999 0.26 AML other m 2023-04-27T09:34:54.30
MN.SENA.HHE. ML:1.7 0.000059399999999999994 0.34 AML other m 2023-04-27T09:34:55.44
TV.SU26.HHN. ML:1.7 0.0000533 0.52 AML other m 2023-04-27T09:34:55.87
TV.SU26.HHE. ML:1.7 0.00005625 1.46 AML other m 2023-04-27T09:34:56.01
IV.AGLI.HHE. ML:2.2 0.00006379999999999999 0.16 AML other m 2023-04-27T09:35:12.82
IV.AGLI.HHN. ML:2.0 0.000042999999999999995 0.72 AML other m 2023-04-27T09:35:13.11
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