Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 29-12-2021 and time 09:22:31 (Italy) in region 2 km E Milo (CT)

A magnitude ML 2.1 earthquake occured in region: 2 km E Milo (CT), on

  • 29-12-2021 08:22:31 (UTC)
  • 29-12-2021 09:22:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 37.7190, 15.1340 at 11 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
Milo CT 2 1087 1087
Sant'Alfio CT 3 1582 2669
Santa Venerina CT 3 8592 11261
Zafferana Etnea CT 4 9517 20778
Giarre CT 5 27659 48437
Riposto CT 6 14838 63275
Mascali CT 7 14282 77557
Fiumefreddo di Sicilia CT 11 9623 87180
Piedimonte Etneo CT 11 3963 91143
Acireale CT 12 52622 143765
Trecastagni CT 12 10910 154675
Viagrande CT 12 8563 163238
Aci Sant'Antonio CT 12 17984 181222
Aci Catena CT 13 29851 211073
Pedara CT 13 14102 225175
Aci Bonaccorsi CT 14 3524 228699
Linguaglossa CT 14 5403 234102
Calatabiano CT 14 5308 239410
Nicolosi CT 15 7463 246873
Valverde CT 15 7840 254713
San Giovanni la Punta CT 16 23060 277773
Tremestieri Etneo CT 17 20589 298362
San Gregorio di Catania CT 17 11966 310328
Mascalucia CT 18 31958 342286
Gaggi ME 18 3184 345470
Aci Castello CT 18 18723 364193
Sant'Agata li Battiati CT 18 9479 373672
Castiglione di Sicilia CT 18 3215 376887
Gravina di Catania CT 19 25838 402725
Giardini-Naxos ME 19 9415 412140
San Pietro Clarenza CT 19 7743 419883
Belpasso CT 20 28108 447991
Ragalna CT 20 3924 451915
Taormina ME 20 10960 462875
Motta Camastra ME 20 845 463720

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km N of Acireale (52622 inhabitants)
24 Km N of Catania (314555 inhabitants)
62 Km SW of Reggio di Calabria (183035 inhabitants)
65 Km SW of Messina (238439 inhabitants)
75 Km N of Siracusa (122291 inhabitants)
95 Km NE of Ragusa (73313 inhabitants)
98 Km E of Caltanissetta (63360 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 2.1 2021-12-29
08:22:31		 37.7188 15.1342 11 2022-03-30
13:04:41		 Bollettino Sismico Italiano INGV 102178831
Reviewed
Rev200 		ML 1.6 2021-12-29
08:22:31		 37.743 15.114 7 2022-03-20
11:02:01		 Sala Operativa INGV_OE (Catania) 99105111
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-12-29 08:22:31 ± 0.1
Latitude 37.7188 ± 0.0054
Longitude 15.1342 ± 0.0057
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 102178831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 609
Semi-minor axis of confidence ellipse (meter) 429
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 160
Circular confidence region, given by single value of horizontal uncertainty (meter) 610.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 97
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 31
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.02968
Epicentral distance of station farthest from the epicenter (degree) 0.38311
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations
Type of magnitude ML
Reference to an origin 99105111
Agency INGV
Autore Sala Operativa INGV_OE (Catania)
Time of creation (UTC) 2021-12-29 08:37:31

ML:2.1

Field Value
Value 2.1
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 102178831
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-20 11:01:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.AIO.HHZ. 2021-12-29T08:22:41.91 0.6 undecidable manual S 17 29.3484 50 -0.01 48
IV.MUCR.HHZ. 2021-12-29T08:22:39.74 0.3 undecidable manual P 328 42.5241 50 0.16 68
IV.EPIT.HHZ. 2021-12-29T08:22:37.74 0.6 undecidable manual S 327 12.2766 131 0.56 43
IV.EPDN.HHZ. 2021-12-29T08:22:37.28 0.6 undecidable manual S 297 11.5773 133 0.3 46
IV.EMFS.HHE. 2021-12-29T08:22:37.46 0.6 undecidable manual S 270 11.9769 132 0.38 46
IV.EPZF.HHZ. 2021-12-29T08:22:37.67 0.3 undecidable manual P 296 26.9508 50 0.5 65
IV.EMPL.HHZ. 2021-12-29T08:22:37.78 0.6 undecidable manual S 253 15.0738 125 -0.15 48
IV.EMCN.HHN. 2021-12-29T08:22:37.25 0.6 undecidable manual S 312 11.877 132 0.17 48
IV.ESLN.HHZ. 2021-12-29T08:22:37.73 0.6 undecidable manual S 259 14.2746 127 0.01 49
IV.AIO.HHZ. 2021-12-29T08:22:37.41 0.1 positive manual P 17 29.3484 50 -0.12 94
IV.EFIU.HHZ. 2021-12-29T08:22:36.94 0.6 undecidable manual S 40 10.2786 136 0.27 47
IV.ECBD.HHN. 2021-12-29T08:22:36.11 0.6 undecidable manual S 328 7.9809 143 -0.04 49
IV.ESPC.HHN. 2021-12-29T08:22:36.63 0.6 undecidable manual S 253 9.7791 137 0.08 49
IV.ESAL.HHZ. 2021-12-29T08:22:35.32 0.6 undecidable manual S 1 3.996 159 -0.16 49
IV.EMPL.HHZ. 2021-12-29T08:22:35.08 0.6 undecidable manual P 253 15.0738 125 -0.15 48
IV.EMFO.HHE. 2021-12-29T08:22:35.36 0.6 undecidable manual S 296 4.2957 158 -0.15 49
IV.EVRN.HNZ. 2021-12-29T08:22:35.98 0.6 undecidable manual S 178 3.2967 163 0.59 44
IV.ESVO.HHE. 2021-12-29T08:22:35.56 0.3 undecidable manual P 290 17.4714 121 -0.08 72
IV.ESLN.HHZ. 2021-12-29T08:22:34.62 0.3 undecidable manual P 259 14.2746 127 -0.49 67
IV.EPIT.HHZ. 2021-12-29T08:22:34.89 0.1 positive manual P 327 12.2766 131 0.1 97
IV.EPDN.HHZ. 2021-12-29T08:22:34.69 0.1 undecidable manual P 297 11.5773 133 0.01 99
IV.EMFS.HHE. 2021-12-29T08:22:34.58 0.1 undecidable manual P 270 11.9769 132 -0.16 96
IV.EFIU.HHZ. 2021-12-29T08:22:34.31 0.1 negative manual P 40 10.2786 136 -0.19 95
IV.ECNE.HHN. 2021-12-29T08:22:34.91 0.3 undecidable manual P 294 12.6762 130 0.06 73
IV.EMCN.HHN. 2021-12-29T08:22:34.66 0.1 undecidable manual P 312 11.877 132 -0.08 97
IV.EPOZ.HHZ. 2021-12-29T08:22:34.58 0.1 positive manual P 137 7.0929 146 0.49 90
IV.ESPC.HHN. 2021-12-29T08:22:34.30 0.1 undecidable manual P 253 9.7791 137 -0.13 97
IV.ESAL.HHZ. 2021-12-29T08:22:33.47 0.1 negative manual P 1 3.996 159 -0.34 93
IV.EMFO.HHE. 2021-12-29T08:22:33.60 0.1 undecidable manual P 296 4.2957 158 -0.23 95
IV.EVRN.HNZ. 2021-12-29T08:22:33.78 0.1 undecidable manual P 178 3.2967 163 0.01 100
IV.ECBD.HHN. 2021-12-29T08:22:33.97 0.1 undecidable manual P 328 7.9809 143 -0.23 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ESAL.HHN. ML:2.3 0.0031157435 0.1792 AML other m 2021-12-29T08:22:35.76
IV.ESAL.HHE. ML:2.4 0.0045342725 0.1792 AML other m 2021-12-29T08:22:35.90
IV.EVRN.HHE. ML:2.3 0.0035532815 0.16 AML other m 2021-12-29T08:22:36.03
IV.EVRN.HHN. ML:2.4 0.0040679215 0.1408 AML other m 2021-12-29T08:22:36.77
IV.EFIU.HHN. ML:2.0 0.001137 0.48 AML other m 2021-12-29T08:22:37.55
IV.EPOZ.HHE. ML:2.1 0.00174 1.44 AML other m 2021-12-29T08:22:38.12
IV.EFIU.HHE. ML:2.0 0.00125 1.32 AML other m 2021-12-29T08:22:38.18
IV.EPOZ.HHN. ML:2.0 0.00158 0.92 AML other m 2021-12-29T08:22:38.30
IV.EPOZ.HNN. ML:2.0 0.001415 1 AML other m 2021-12-29T08:22:38.31
IV.EPIT.HHE. ML:2.6 0.004665 0.18 AML other m 2021-12-29T08:22:38.22
IV.EPOZ.HNE. ML:2.1 0.0017800000000000001 1.34 AML other m 2021-12-29T08:22:39.18
IV.EMPL.HHN. ML:2.2 0.001425 0.22 AML other m 2021-12-29T08:22:40.01
IV.EPIT.HHN. ML:2.6 0.004755 0.98 AML other m 2021-12-29T08:22:40.96
IV.AIO.HHE. ML:1.8 0.00028849999999999997 0.22 AML other m 2021-12-29T08:22:42.22
IV.EMPL.HHE. ML:2.2 0.001445 0.24 AML other m 2021-12-29T08:22:42.67
IV.AIO.HHN. ML:1.7 0.00025 0.52 AML other m 2021-12-29T08:22:44.36
IV.EPZF.HHE. ML:2.0 0.0005415 0.42 AML other m 2021-12-29T08:22:44.68
IV.EPZF.HHN. ML:1.9 0.0004725 0.42 AML other m 2021-12-29T08:22:45.08
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