Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 11-09-2021 and time 06:15:05 (UTC) in region Costa Ragusana (Ragusa)

A magnitude ML 1.6 earthquake occured in region: Costa Ragusana (Ragusa), on

  • 11-09-2021 06:15:05 (UTC)
  • 11-09-2021 08:15:05 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 36.6030, 14.7690 at 9 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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
Pozzallo RG 16 19552 19552

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km S of Modica (54633 inhabitants)
36 Km S of Ragusa (73313 inhabitants)
44 Km SE of Vittoria (63339 inhabitants)
69 Km SW of Siracusa (122291 inhabitants)
69 Km SE of Gela (75827 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 1.6 2021-09-11
06:15:05		 36.6027 14.7692 9 2022-03-30
13:04:07		 Bollettino Sismico Italiano INGV 95934231
Reviewed
Rev100 		ML 1.8 2021-09-11
06:15:05		 36.6292 14.75 9 2021-09-11
06:41:49		 Sala Sismica INGV-Roma 95292011
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-11 06:15:05 ± 0.33
Latitude 36.6027 ± 0.0162
Longitude 14.7692 ± 0.0146
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95934231

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1882
Semi-minor axis of confidence ellipse (meter) 1168
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 162
Circular confidence region, given by single value of horizontal uncertainty (meter) 1880.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 294
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.75003
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 95292011
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-11 06:41:49

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 95934231
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-07 14:53:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HLNI.HHZ. 2021-09-11T06:15:30.38 0.6 undecidable manual S 6 83.25 50 0.03 45
IV.HAGA.HHE. 2021-09-11T06:15:30.27 0.6 undecidable manual S 24 83.0502 50 -0.04 45
IV.SSY.HHZ. 2021-09-11T06:15:26.53 0.6 undecidable manual S 24 67.2771 50 0.45 42
IV.HAVL.HHZ. 2021-09-11T06:15:21.56 0.6 undecidable manual S 38 50.5161 50 -0.05 47
IV.HVIT.HHE. 2021-09-11T06:15:20.72 0.6 undecidable manual S 333 48.5181 50 -0.37 44
IV.RAFF.HHE. 2021-09-11T06:15:19.75 0.3 undecidable manual P 332 77.6667 50 0.86 53
IV.HAGA.HHE. 2021-09-11T06:15:19.97 0.3 undecidable manual P 24 83.0502 50 0.25 64
IV.HLNI.HHZ. 2021-09-11T06:15:19.56 0.1 undecidable manual P 6 83.25 50 -0.19 86
IV.SSY.HHZ. 2021-09-11T06:15:17.17 0.1 undecidable manual P 24 67.2771 50 -0.12 91
IV.HSRS.HHE. 2021-09-11T06:15:17.37 0.3 undecidable manual P 36 67.5768 50 0.03 69
IV.HPAC.HHZ. 2021-09-11T06:15:15.73 0.6 undecidable manual Sg 100
IV.HAVL.HHZ. 2021-09-11T06:15:14.45 0.3 undecidable manual P 38 50.5161 50 -0.26 68
IV.HVIT.HHE. 2021-09-11T06:15:14.12 0.3 undecidable manual P 333 48.5181 50 -0.28 68
IV.ISPIC.EHZ. 2021-09-11T06:15:13.85 0.6 undecidable manual S 31 23.0547 112 -0.03 50
IV.HPAC.HHZ. 2021-09-11T06:15:11.34 0.1 positive manual P 0.09 98
IV.ISPIC.EHZ. 2021-09-11T06:15:10.26 0.1 undecidable manual P 31 23.0547 112 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ISPIC.EHE. ML:1.4 0.00014364880500000003 0.2592 AML other m 2021-09-11T06:15:14.07
IV.ISPIC.HNE. ML:1.3 0.00014191103 0.2592 AML other m 2021-09-11T06:15:14.07
IV.ISPIC.HNN. ML:1.4 0.000167240475 0.688 AML other m 2021-09-11T06:15:14.27
IV.ISPIC.EHN. ML:1.3 0.00013634486 0.0992 AML other m 2021-09-11T06:15:14.28
IV.SSY.HHE. ML:2.2 0.00027598935 0.5984 AML other m 2021-09-11T06:15:26.67
IV.SSY.HHN. ML:2.4 0.0004848923 0.2016 AML other m 2021-09-11T06:15:27.60
IV.HLNI.HHN. ML:1.5 0.00004158506 0.8 AML other m 2021-09-11T06:15:31.23
IV.HLNI.HHE. ML:1.8 0.0000866 0.66 AML other m 2021-09-11T06:15:30.51
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