Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 24-08-2021 and time 17:05:41 (UTC) in region 3 km NW Motta Sant'Anastasia (CT)

A magnitude ML 1.7 earthquake occured in region: 3 km NW Motta Sant'Anastasia (CT), on

  • 24-08-2021 17:05:41 (UTC)
  • 24-08-2021 19:05:41 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.5360, 14.9560 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
Motta Sant'Anastasia CT 3 12116 12116
Misterbianco CT 5 49410 61526
Camporotondo Etneo CT 6 5023 66549
Paternò CT 7 48228 114777
Belpasso CT 7 28108 142885
San Pietro Clarenza CT 7 7743 150628
Mascalucia CT 10 31958 182586
Gravina di Catania CT 10 25838 208424
Ragalna CT 11 3924 212348
Nicolosi CT 11 7463 219811
Santa Maria di Licodia CT 11 7641 227452
Tremestieri Etneo CT 11 20589 248041
Sant'Agata li Battiati CT 11 9479 257520
Catania CT 12 314555 572075
Pedara CT 13 14102 586177
San Giovanni la Punta CT 13 23060 609237
San Gregorio di Catania CT 14 11966 621203
Biancavilla CT 14 24007 645210
Trecastagni CT 14 10910 656120
Viagrande CT 15 8563 664683
Aci Bonaccorsi CT 15 3524 668207
Valverde CT 16 7840 676047
Aci Castello CT 17 18723 694770
Aci Sant'Antonio CT 17 17984 712754
Adrano CT 18 36122 748876
Aci Catena CT 18 29851 778727

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km W of Catania (314555 inhabitants)
21 Km W of Acireale (52622 inhabitants)
61 Km NW of Siracusa (122291 inhabitants)
71 Km N of Ragusa (73313 inhabitants)
75 Km NE of Vittoria (63339 inhabitants)
77 Km N of Modica (54633 inhabitants)
79 Km E of Caltanissetta (63360 inhabitants)
81 Km NE of Gela (75827 inhabitants)
88 Km SW of Reggio di Calabria (183035 inhabitants)
90 Km SW of Messina (238439 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 2021-08-24
17:05:41		 37.5357 14.9563 8 2021-12-29
11:12:27		 Bollettino Sismico Italiano INGV 95189611
Reviewed
Rev200 		ML 1.5 2021-08-24
17:05:41		 37.538 14.951 7 2021-12-01
11:43:36		 Sala Operativa INGV_OE (Catania) 94592481
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-24 17:05:41 ± 0.09
Latitude 37.5357 ± 0.0054
Longitude 14.9563 ± 0.0102
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 95189611

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 889
Semi-minor axis of confidence ellipse (meter) 522
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 90
Circular confidence region, given by single value of horizontal uncertainty (meter) 890.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 105
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 35
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.35
Epicentral distance of station closest to the epicenter (degree) 0.10252
Epicentral distance of station farthest from the epicenter (degree) 0.59085
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 25
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 25
Type of magnitude ML
Reference to an origin 95189611
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-01 11:43:25

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations
Type of magnitude ML
Reference to an origin 94592481
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-08-24 17:26:55
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HAVL.HHZ. 2021-08-24T17:06:02.74 0.6 undecidable manual S 167 65.5899 50 0.47 42
IV.RAFF.HHZ. 2021-08-24T17:06:02.17 0.6 undecidable manual S 237 62.7927 50 0.63 39
IV.HAGA.HHZ. 2021-08-24T17:05:53.96 0.6 undecidable manual S 148 32.8449 104 0.55 45
IV.HAVL.HHZ. 2021-08-24T17:05:53.29 0.1 undecidable manual P 167 65.5899 50 -0.27 88
IV.RAFF.HHZ. 2021-08-24T17:05:52.82 0.1 undecidable manual P 237 62.7927 50 -0.32 88
IV.MUCR.HHZ. 2021-08-24T17:05:52.07 0.1 undecidable manual P 353 56.6988 50 -0.13 93
IV.HLNI.HHZ. 2021-08-24T17:05:50.30 0.6 undecidable manual S 200 22.0668 110 0.48 47
IV.EMFO.HHE. 2021-08-24T17:05:50.20 0.6 undecidable manual S 28 25.0527 108 -0.62 43
IV.CAGR.HHZ. 2021-08-24T17:05:50.21 0.3 undecidable manual P 284 41.2254 50 0.39 66
IV.HVZN.HHZ. 2021-08-24T17:05:49.80 0.3 undecidable manual P 208 45.0216 50 -0.59 63
IV.ESLN.HHZ. 2021-08-24T17:05:49.39 0.6 undecidable manual S 5 17.5713 115 1.01 37
IV.EMFS.HHZ. 2021-08-24T17:05:49.77 0.6 undecidable manual S 10 20.7681 111 0.38 47
IV.ESPC.HHZ. 2021-08-24T17:05:49.07 0.6 undecidable manual S 20 18.4704 114 0.4 47
IV.GALF.HHZ. 2021-08-24T17:05:49.79 0.1 undecidable manual P 300 39.3273 50 0.26 91
IV.EMPL.HHZ. 2021-08-24T17:05:48.60 0.6 undecidable manual S 4 15.9729 117 0.73 42
IV.EPZF.HHZ. 2021-08-24T17:05:48.54 0.1 undecidable manual P 345 33.1446 104 0.04 98
IV.EMSG.HHZ. 2021-08-24T17:05:48.07 0.1 undecidable manual P 359 31.6461 104 -0.14 96
IV.HAGA.HHZ. 2021-08-24T17:05:48.65 0.1 undecidable manual P 148 32.8449 104 0.2 96
IV.EVRN.HHZ. 2021-08-24T17:05:47.68 1.0 undecidable manual P 43 23.1546 109 1.09 18
IV.EMCN.HHN. 2021-08-24T17:05:47.04 0.3 undecidable manual P 13 29.1486 106 -0.69 62
IV.EMNR.HHZ. 2021-08-24T17:05:47.87 0.3 undecidable manual P 11 31.746 104 -0.36 69
IV.ESCV.HHZ. 2021-08-24T17:05:47.35 0.3 undecidable manual P 332 26.5512 107 0.13 73
IV.ESVO.HHE. 2021-08-24T17:05:47.55 0.1 undecidable manual P 358 26.3514 107 0.36 92
IV.ECBD.HHN. 2021-08-24T17:05:47.06 0.3 undecidable manual P 23 29.4483 105 -0.72 61
IV.HLNI.HHZ. 2021-08-24T17:05:46.14 0.1 undecidable manual P 200 22.0668 110 -0.23 94
IV.EMFS.HHZ. 2021-08-24T17:05:46.04 0.3 undecidable manual P 10 20.7681 111 -0.09 74
IV.ESML.HHZ. 2021-08-24T17:05:46.31 0.6 undecidable manual S 323 11.3775 126 -0.21 48
IV.ECZM.HHN. 2021-08-24T17:05:46.26 0.1 undecidable manual P 348 22.1556 110 -0.14 98
IV.EMFO.HHE. 2021-08-24T17:05:46.34 0.3 undecidable manual P 28 25.0527 108 -0.61 64
IV.ESPC.HHZ. 2021-08-24T17:05:45.67 0.1 undecidable manual P 20 18.4704 114 -0.04 100
IV.EMPL.HHZ. 2021-08-24T17:05:45.51 0.1 negative manual P 4 15.9729 117 0.26 96
IV.ESLN.HHZ. 2021-08-24T17:05:45.68 0.1 undecidable manual P 5 17.5713 115 0.14 99
IV.ECHR.HNZ. 2021-08-24T17:05:45.35 0.1 undecidable manual P 347 17.1717 115 -0.11 99
IV.ENIC.HHZ. 2021-08-24T17:05:45.38 0.3 undecidable manual P 28 12.0768 124 0.8 62
IV.ESML.HHZ. 2021-08-24T17:05:44.03 0.1 undecidable manual P 323 11.3775 126 -0.44 93
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESML.HHN. ML:1.9 0.001131 0.32 AML other m 2021-08-24T17:05:46.35
IV.ESML.HNN. ML:1.9 0.0010985 0.84 AML other m 2021-08-24T17:05:46.38
IV.ESML.HNE. ML:1.9 0.001109 0.18 AML other m 2021-08-24T17:05:46.50
IV.ESML.HHE. ML:2.0 0.0012225 0.16 AML other m 2021-08-24T17:05:46.50
IV.ENIC.HHE. ML:1.3 0.0002606471 0.0896 AML other m 2021-08-24T17:05:47.72
IV.EMPL.HHN. ML:2.3 0.0017850830000000002 0.448 AML other m 2021-08-24T17:05:49.36
IV.EMPL.HHE. ML:2.0 0.00108682215 0.4096 AML other m 2021-08-24T17:05:49.38
IV.EMSG.HHN. ML:1.4 0.0001214408 1.3952 AML other m 2021-08-24T17:05:49.98
IV.HLNI.HHN. ML:1.2 0.0001148117 0.1024 AML other m 2021-08-24T17:05:50.47
IV.ESCV.HHN. ML:1.5 0.0001909819 0.2432 AML other m 2021-08-24T17:05:51.65
IV.ESCV.HHE. ML:1.6 0.0002545244 0.2176 AML other m 2021-08-24T17:05:52.79
IV.EMSG.HHE. ML:1.6 0.00016265599999999998 0.4992 AML other m 2021-08-24T17:05:53.59
IV.EPZF.HHE. ML:1.2 0.00007399631000000001 1.0368 AML other m 2021-08-24T17:05:54.12
IV.HAGA.HHN. ML:1.6 0.00019345594999999998 0.1536 AML other m 2021-08-24T17:05:54.22
IV.HAGA.HHE. ML:1.8 0.0003095 0.58 AML other m 2021-08-24T17:05:54.17
IV.GALF.HHE. ML:1.4 0.00009419558 0.8448 AML other m 2021-08-24T17:05:56.26
IV.GALF.HHN. ML:1.8 0.0001985 0.5 AML other m 2021-08-24T17:05:59.20
IV.HVZN.HHN. ML:1.7 0.00014250000000000002 0.28 AML other m 2021-08-24T17:06:00.42
IV.CAGR.HHE. ML:1.6 0.0001425 0.74 AML other m 2021-08-24T17:06:01.03
IV.CAGR.HHN. ML:1.6 0.0001455 0.36 AML other m 2021-08-24T17:06:02.28
IV.MUCR.HHE. ML:1.4 0.0000485 0.38 AML other m 2021-08-24T17:06:02.11
IV.HVZN.HHE. ML:1.8 0.000182 1.58 AML other m 2021-08-24T17:06:02.92
IV.RAFF.HHN. ML:1.8 0.0001266 0.22 AML other m 2021-08-24T17:06:03.52
IV.RAFF.HHE. ML:1.6 0.0000816 1.2 AML other m 2021-08-24T17:06:03.09
IV.MUCR.HHN. ML:1.4 0.000051250000000000006 0.46 AML other m 2021-08-24T17:06:04.10
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