Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 30-08-2021 and time 19:42:26 (UTC) in region 5 km NW Ragusa (RG)

A magnitude ML 1.6 earthquake occured in region: 5 km NW Ragusa (RG), on

  • 30-08-2021 19:42:26 (UTC)
  • 30-08-2021 21:42:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 36.9530, 14.6840 at 16 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
Ragusa RG 5 73313 73313
Comiso RG 7 30156 103469
Chiaramonte Gulfi RG 9 8238 111707
Modica RG 12 54633 166340
Vittoria RG 13 63339 229679
Giarratana RG 15 3048 232727
Monterosso Almo RG 17 3032 235759
Scicli RG 18 27077 262836
Mazzarrone CT 18 4078 266914
Acate RG 19 10954 277868
Santa Croce Camerina RG 20 10823 288691

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km NW of Ragusa (73313 inhabitants)
12 Km NW of Modica (54633 inhabitants)
13 Km E of Vittoria (63339 inhabitants)
41 Km E of Gela (75827 inhabitants)
56 Km W of Siracusa (122291 inhabitants)
71 Km SW of Catania (314555 inhabitants)
82 Km SE of Caltanissetta (63360 inhabitants)
85 Km SW of Acireale (52622 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 2021-08-30
19:42:26		 36.9527 14.684 16 2021-12-29
11:12:31		 Bollettino Sismico Italiano INGV 95655771
Reviewed
Rev100 		ML 1.6 2021-08-30
19:42:26		 36.9477 14.6797 18 2021-08-30
19:49:00		 Sala Sismica INGV-Roma 94832081
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-30 19:42:26 ± 0.11
Latitude 36.9527 ± 0.0045
Longitude 14.6840 ± 0.0056
Depth (km) 16 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 95655771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 444
Semi-minor axis of confidence ellipse (meter) 335
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 39
Circular confidence region, given by single value of horizontal uncertainty (meter) 440.0
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 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.07914
Epicentral distance of station farthest from the epicenter (degree) 0.50092
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 26
Type of magnitude ML
Reference to an origin 95655771
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-17 14:05:18

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 94832081
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-30 19:49:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HAGA.HHZ. 2021-08-30T19:42:44.39 0.6 undecidable manual S 48 55.5999 97 0.36 45
IV.HLNI.HHZ. 2021-08-30T19:42:41.87 0.6 undecidable manual S 21 46.9197 98 0.14 48
IV.SSY.HHZ. 2021-08-30T19:42:40.56 0.3 undecidable manual S 56 41.3253 100 0.32 69
IV.HAVL.HHZ. 2021-08-30T19:42:39.41 0.3 undecidable manual S 89 38.8278 101 -0.19 74
IV.HVZN.HHZ. 2021-08-30T19:42:36.07 0.6 undecidable manual S 6 25.1526 110 0 51
IV.ISPIC.EHZ. 2021-08-30T19:42:36.81 0.6 undecidable manual S 134 27.2505 108 0.22 49
IV.HAGA.HHZ. 2021-08-30T19:42:36.54 0.3 undecidable manual P 48 55.5999 97 -0.14 72
IT.LNT.HGE. 2021-08-30T19:42:35.25 0.3 undecidable manual P 37 46.7199 98 -0.06 74
IV.HLNI.HHZ. 2021-08-30T19:42:35.09 0.1 undecidable manual P 21 46.9197 98 -0.26 95
IV.HSRS.HHZ. 2021-08-30T19:42:35.69 0.3 undecidable manual P 72 50.1165 98 -0.15 73
IV.RAFF.HHZ. 2021-08-30T19:42:34.88 0.3 undecidable manual P 317 41.3253 100 0.39 70
IV.SSY.HHZ. 2021-08-30T19:42:34.56 0.3 undecidable manual P 56 41.3253 100 0.07 74
IV.HPAC.HHE. 2021-08-30T19:42:34.70 0.3 undecidable manual P 131 41.4252 100 0.19 72
IV.ACATE.HNZ. 2021-08-30T19:42:34.50 0.6 undecidable manual S 296 18.0708 121 0.15 51
IV.HAVL.HHZ. 2021-08-30T19:42:33.93 0.3 undecidable manual P 89 38.8278 101 -0.19 73
IV.HVIT.HHZ. 2021-08-30T19:42:33.52 0.6 undecidable manual S 287 15.0738 127 -0.16 50
IV.HMDC.HHZ. 2021-08-30T19:42:32.71 0.6 undecidable manual S 85 8.7801 145 0.18 51
IV.ISPIC.EHZ. 2021-08-30T19:42:32.24 0.1 undecidable manual P 134 27.2505 108 -0.15 100
IV.ACATE.HNZ. 2021-08-30T19:42:31.41 0.3 undecidable manual P 296 18.0708 121 0.31 74
IV.HVZN.HHZ. 2021-08-30T19:42:31.88 0.3 undecidable manual P 6 25.1526 110 -0.2 75
IV.HVIT.HHZ. 2021-08-30T19:42:30.42 0.1 undecidable manual P 287 15.0738 127 -0.29 99
IV.HMDC.HHZ. 2021-08-30T19:42:29.98 0.3 undecidable manual P 85 8.7801 145 -0.06 79
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HMDC.HHE. ML:1.4 0.00025187705 0.064 AML other m 2021-08-30T19:42:32.86
IV.HMDC.HNN. ML:1.7 0.0004297981 0.1536 AML other m 2021-08-30T19:42:32.80
IV.HMDC.HHN. ML:1.7 0.0005235 0.18 AML other m 2021-08-30T19:42:32.79
IV.HVIT.HHE. ML:2.1 0.000901 0.08 AML other m 2021-08-30T19:42:33.58
IV.HVIT.HHN. ML:1.9 0.000621 0.08 AML other m 2021-08-30T19:42:33.59
IV.HMDC.HNE. ML:1.3 0.0001944061 0.1408 AML other m 2021-08-30T19:42:33.63
IV.HVZN.HNE. ML:1.2 0.000074365605 0.896 AML other m 2021-08-30T19:42:36.15
IV.HVZN.HNN. ML:1.5 0.00016227790000000001 1.2672 AML other m 2021-08-30T19:42:36.70
IV.HVZN.HHE. ML:1.4 0.00012727489999999998 0.7808 AML other m 2021-08-30T19:42:36.54
IV.HVZN.HHN. ML:1.2 0.00008599771 1.024 AML other m 2021-08-30T19:42:36.24
IV.ISPIC.HNN. ML:1.6 0.0001779955 0.2048 AML other m 2021-08-30T19:42:36.87
IV.ISPIC.EHN. ML:1.5 0.00014616606000000001 0.192 AML other m 2021-08-30T19:42:36.88
IV.ISPIC.HNE. ML:1.7 0.000245510345 1.6928 AML other m 2021-08-30T19:42:37.02
IV.ISPIC.EHE. ML:1.6 0.00018575000000000002 1.72 AML other m 2021-08-30T19:42:37.88
IV.HAVL.HHE. ML:1.8 0.0002184096 0.1408 AML other m 2021-08-30T19:42:40.40
IV.SSY.HHE. ML:1.6 0.0001274243 0.6784 AML other m 2021-08-30T19:42:40.36
IV.HAVL.HHN. ML:2.0 0.0003033301 0.192 AML other m 2021-08-30T19:42:40.71
IV.SSY.HHN. ML:1.9 0.00024986835 1.6128 AML other m 2021-08-30T19:42:40.09
IV.HLNI.HHE. ML:2.0 0.000245 0.12 AML other m 2021-08-30T19:42:42.16
IV.RAFF.HHE. ML:1.2 0.000044223280000000006 0.3584 AML other m 2021-08-30T19:42:42.57
IV.HLNI.HHN. ML:1.6 0.00012071835 0.0768 AML other m 2021-08-30T19:42:42.54
IV.RAFF.HHN. ML:1.2 0.000045236110000000006 0.384 AML other m 2021-08-30T19:42:43.99
IV.HSRS.HHE. ML:1.3 0.00004934571 3.3792 AML other m 2021-08-30T19:42:43.21
IV.HAGA.HHN. ML:1.6 0.0000814952 1.7952 AML other m 2021-08-30T19:42:46.99
IV.HAGA.HHE. ML:1.7 0.000118 1.78 AML other m 2021-08-30T19:42:46.10
IV.HSRS.HHN. ML:1.3 0.000050374635 1.4592 AML other m 2021-08-30T19:42:45.88
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