Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 09-01-2021 and time 12:28:56 (UTC) in region 6 km NE Modica (RG)

A magnitude ML 1.7 earthquake occured in region: 6 km NE Modica (RG), on

  • 09-01-2021 12:28:56 (UTC)
  • 09-01-2021 13:28:56 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 36.9000, 14.8080 at 24 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
Modica RG 6 54633 54633
Ragusa RG 7 73313 127946
Scicli RG 15 27077 155023
Ispica RG 15 16061 171084
Rosolini SR 16 21427 192511
Giarratana RG 17 3048 195559
Chiaramonte Gulfi RG 18 8238 203797
Comiso RG 19 30156 233953
Pozzallo RG 20 19552 253505
Palazzolo Acreide SR 20 8808 262313

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km NE of Modica (54633 inhabitants)
7 Km E of Ragusa (73313 inhabitants)
25 Km E of Vittoria (63339 inhabitants)
47 Km W of Siracusa (122291 inhabitants)
53 Km E of Gela (75827 inhabitants)
72 Km SW of Catania (314555 inhabitants)
85 Km SW of Acireale (52622 inhabitants)
93 Km SE 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 1.7 2021-01-09
12:28:56		 36.9003 14.8083 24 2021-07-12
16:55:03		 Bollettino Sismico Italiano INGV 88460521
Reviewed
Rev100 		ML 1.9 2021-01-09
12:28:55		 36.9033 14.7937 25 2021-01-09
12:36:56		 Sala Sismica INGV-Roma 86121301
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-09 12:28:56 ± 0.09
Latitude 36.9003 ± 0.0027
Longitude 14.8083 ± 0.0034
Depth (km) 24 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 88460521

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 340
Semi-minor axis of confidence ellipse (meter) 186
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 56
Circular confidence region, given by single value of horizontal uncertainty (meter) 340.0
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 21
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.06205
Epicentral distance of station farthest from the epicenter (degree) 0.47934
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 88460521
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-07 01:04:30

ML:1.9

Field Value
Value 1.9
Uncertainty 0.5
Num. used stations 10
Type of magnitude ML
Reference to an origin 86121301
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-09 12:36:56
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.HLNI.HHE. 2021-01-09T12:29:12.60 0.3 undecidable manual S 6 50.0166 109 -0.04 70
IV.HCRL.HHZ. 2021-01-09T12:29:12.00 0.6 undecidable manual S 25 46.8198 110 0.16 46
IV.SSY.HHZ. 2021-01-09T12:29:09.70 0.6 undecidable manual S 39 36.9297 116 0.28 46
IV.ACATE.EHZ. 2021-01-09T12:29:08.16 0.6 undecidable manual S 297 30.5472 122 0.25 46
IV.HVZN.HNZ. 2021-01-09T12:29:08.36 0.6 undecidable manual S 345 31.9458 120 0.14 48
IV.HPAC.HHE. 2021-01-09T12:29:07.88 0.3 undecidable manual S 136 29.4483 123 0.22 70
IV.HAVL.HHZ. 2021-01-09T12:29:07.37 0.6 undecidable manual S 77 28.5492 124 -0.1 48
IV.CROCE.HHZ. 2021-01-09T12:29:06.66 0.6 undecidable manual S 253 25.4523 127 -0.13 48
IV.RAFF.HHZ. 2021-01-09T12:29:06.57 0.1 undecidable manual P 312 53.2023 107 0.38 86
IV.HLNI.HHE. 2021-01-09T12:29:05.58 0.3 undecidable manual P 6 50.0166 109 -0.14 69
IV.HCRL.HHZ. 2021-01-09T12:29:05.08 0.3 undecidable manual P 25 46.8198 110 -0.18 69
IV.ISPIC.EHZ. 2021-01-09T12:29:04.96 0.6 undecidable manual S 148 15.7731 143 0.01 50
IV.HVZN.HNZ. 2021-01-09T12:29:03.06 0.1 undecidable manual P 345 31.9458 120 -0.11 96
IV.HMDC.HHZ. 2021-01-09T12:29:03.80 0.3 undecidable manual S 341 6.8931 162 -0.03 75
IV.ACATE.EHZ. 2021-01-09T12:29:03.09 0.3 undecidable manual P 297 30.5472 122 0.11 71
IV.SSY.HHZ. 2021-01-09T12:29:03.78 0.1 undecidable manual P 39 36.9297 116 -0.07 95
IV.HPAC.HHE. 2021-01-09T12:29:02.90 0.3 undecidable manual P 136 29.4483 123 0.06 73
IV.HAVL.HHZ. 2021-01-09T12:29:02.56 0.3 undecidable manual P 77 28.5492 124 -0.17 71
IV.CROCE.HHZ. 2021-01-09T12:29:02.14 0.3 undecidable manual P 253 25.4523 127 -0.2 71
IV.ISPIC.EHZ. 2021-01-09T12:29:01.19 0.3 undecidable manual P 148 15.7731 143 -0.08 74
IV.HMDC.HHZ. 2021-01-09T12:29:00.55 0.1 undecidable manual P 341 6.8931 162 -0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HMDC.HHE. ML:1.3 0.00012319153499999998 0.0576 AML other m 2021-01-09T12:29:04.14
IV.HMDC.HHN. ML:1.3 0.00012328915 0.0768 AML other m 2021-01-09T12:29:05.52
IV.CROCE.HHN. ML:1.2 0.00006009065500000001 0.1408 AML other m 2021-01-09T12:29:07.00
IV.CROCE.HHE. ML:1.0 0.00003870763 0.1984 AML other m 2021-01-09T12:29:07.50
IV.HAVL.HHE. ML:1.9 0.00032386065 0.0832 AML other m 2021-01-09T12:29:07.69
IV.HAVL.HHN. ML:2.0 0.00038254350000000006 0.1408 AML other m 2021-01-09T12:29:07.70
IV.SSY.HHN. ML:1.9 0.000266017 0.16 AML other m 2021-01-09T12:29:10.97
IV.SSY.HHE. ML:1.7 0.00017305224999999999 0.1536 AML other m 2021-01-09T12:29:12.19
IV.HCRL.HHE. ML:1.9 0.00020876633 0.1408 AML other m 2021-01-09T12:29:13.27
IV.HCRL.HHN. ML:1.8 0.00013777522000000002 0.1536 AML other m 2021-01-09T12:29:13.27
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