Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 19-09-2021 and time 18:55:03 (Italy) in region Costa Ragusana (Ragusa)

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

  • 19-09-2021 16:55:03 (UTC)
  • 19-09-2021 18:55:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 36.5850, 14.9600 at 8 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 19 19552 19552
Pachino SR 19 22205 41757
Portopalo di Capo Passero SR 19 3887 45644

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km SE of Modica (54633 inhabitants)
43 Km SE of Ragusa (73313 inhabitants)
55 Km SE of Vittoria (63339 inhabitants)
61 Km SW of Siracusa (122291 inhabitants)
83 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 2021-09-19
16:55:03		 36.5852 14.9602 8 2022-03-30
13:04:12		 Bollettino Sismico Italiano INGV 96797311
Reviewed
Rev100 		ML 1.7 2021-09-19
16:55:03		 36.5972 14.969 8 2021-09-19
17:07:15		 Sala Sismica INGV-Roma 95638501
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-19 16:55:03 ± 0.31
Latitude 36.5852 ± 0.0126
Longitude 14.9602 ± 0.0134
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96797311

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1427
Semi-minor axis of confidence ellipse (meter) 1140
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 340
Circular confidence region, given by single value of horizontal uncertainty (meter) 1430.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 297
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.20055
Epicentral distance of station farthest from the epicenter (degree) 0.79590
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 96797311
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-01-03 09:48:53

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 95638501
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-19 17:07:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HLNI.HHZ. 2021-09-19T16:55:28.63 0.3 undecidable manual S 355 85.0482 50 -0.38 63
IV.HCRL.HHN. 2021-09-19T16:55:26.92 0.6 undecidable manual S 5 77.6667 50 -0.13 45
IV.HVZN.HHE. 2021-09-19T16:55:25.17 0.6 undecidable manual S 342 69.2751 50 0.36 44
IV.SSY.HHZ. 2021-09-19T16:55:23.71 0.3 undecidable manual S 9 64.2912 50 0.23 68
IV.ACATE.EHZ. 2021-09-19T16:55:23.96 1.0 undecidable manual S 320 63.492 50 0.69 20
IV.HSRS.HNN. 2021-09-19T16:55:22.79 0.3 undecidable manual S 22 60.8946 50 0.21 68
IV.HVIT.HHE. 2021-09-19T16:55:21.84 0.3 undecidable manual S 319 59.6958 50 -0.4 66
IV.RAFF.HHZ. 2021-09-19T16:55:19.30 0.3 undecidable manual P 323 88.3449 50 0.72 56
IV.HLNI.HHZ. 2021-09-19T16:55:18.24 0.1 undecidable manual P 355 85.0482 50 0.18 88
IV.HAVL.HHZ. 2021-09-19T16:55:18.06 0.6 undecidable manual S 19 43.9227 50 0.01 49
IV.HCRL.HHN. 2021-09-19T16:55:17.08 0.3 undecidable manual P 5 77.6667 50 0.15 67
IV.SSY.HHZ. 2021-09-19T16:55:15.04 0.1 undecidable manual P 9 64.2912 50 0.17 91
IV.HVZN.HHE. 2021-09-19T16:55:15.39 0.6 undecidable manual P 342 69.2751 50 -0.24 45
IV.ACATE.EHZ. 2021-09-19T16:55:14.27 1.0 undecidable manual P 320 63.492 50 -0.48 21
IV.HSRS.HNN. 2021-09-19T16:55:13.98 1.0 undecidable manual P 22 60.8946 50 -0.37 22
IV.HVIT.HHE. 2021-09-19T16:55:13.98 0.3 undecidable manual P 319 59.6958 50 -0.17 69
IV.HAVL.HHZ. 2021-09-19T16:55:11.17 0.1 undecidable manual P 19 43.9227 50 -0.56 87
IV.ISPIC.EHZ. 2021-09-19T16:55:11.17 0.3 undecidable manual S 347 22.2555 109 -0.09 75
IV.ISPIC.EHZ. 2021-09-19T16:55:07.92 0.1 undecidable manual P 347 22.2555 109 0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ISPIC.EHE. ML:1.6 0.0002829615 0.1536 AML other m 2021-09-19T16:55:11.36
IV.ISPIC.HNE. ML:1.6 0.0002789028 1.872 AML other m 2021-09-19T16:55:12.04
IV.ISPIC.EHN. ML:1.4 0.0001928031 0.1664 AML other m 2021-09-19T16:55:12.48
IV.ISPIC.HNN. ML:1.5 0.000199899 0.1536 AML other m 2021-09-19T16:55:12.49
IV.HAVL.HHN. ML:1.4 0.000081630065 0.6784 AML other m 2021-09-19T16:55:18.87
IV.HAVL.HHE. ML:1.2 0.000053826115 0.2688 AML other m 2021-09-19T16:55:19.01
IV.SSY.HHN. ML:2.0 0.0002110127 0.1792 AML other m 2021-09-19T16:55:24.06
IV.SSY.HHE. ML:2.0 0.00016759885000000002 0.2176 AML other m 2021-09-19T16:55:24.02
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