Earthquake with magnitude of ML 1.8 on date 18-09-2021 and time 11:19:50 (UTC) in region 10 km NE Scordia (CT)

A magnitude ML 1.8 earthquake occured in region: 10 km NE Scordia (CT), on

  • 18-09-2021 11:19:50 (UTC)
  • 18-09-2021 13:19:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.37, 14.918 at 16 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Scordia CT 10 17095 17095
Lentini SR 12 24085 41180
Carlentini SR 13 17798 58978
Militello in Val di Catania CT 15 7443 66421
Francofonte SR 16 12800 79221
Palagonia CT 16 16608 95829
Motta Sant'Anastasia CT 17 12116 107945
Misterbianco CT 19 49410 157355
Ramacca CT 20 10894 168249

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km SW of Catania (314555 inhabitants)
35 Km SW of Acireale (52622 inhabitants)
48 Km NW of Siracusa (122291 inhabitants)
52 Km NE of Ragusa (73313 inhabitants)
58 Km NE of Vittoria (63339 inhabitants)
58 Km N of Modica (54633 inhabitants)
68 Km NE of Gela (75827 inhabitants)
77 Km E of Caltanissetta (63360 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.8 2021-09-18
11:19:50
37.3695 14.9183 17 2021-09-18
11:39:25
Sala Sismica INGV-Roma 95582501
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-18 11:19:50 ± 0.14
Latitude 37.3695 ± 0.0054
Longitude 14.9183 ± 0.0057
Depth (km) 17 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 95582501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 540
Semi-minor axis of confidence ellipse (meter) 465
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 342
Circular confidence region, given by single value of horizontal uncertainty (meter) 540
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 234
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.44067
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 95582501
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-18 11:39:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.HAVL.HHZ. 2021-09-18T11:20:06.08 0.3 undecidable manual S 158 0.4407 98 -0.03 71
IV.SSY.HHZ. 2021-09-18T11:20:00.58 0.3 undecidable manual S 150 0.2455 109 0.12 72
IV.HAVL.HHZ. 2021-09-18T11:19:59.36 0.1 undecidable manual P 158 0.4407 98 -0.15 91
IV.HAGA.HHZ. 2021-09-18T11:19:59.25 0.1 undecidable manual S 114 0.2059 114 -0.14 95
IV.HCRL.HHZ. 2021-09-18T11:19:57.39 0.1 undecidable manual S 134 0.125 131 0.03 100
IV.SSY.HHZ. 2021-09-18T11:19:56.34 0.1 undecidable manual P 150 0.2455 109 0.09 96
IV.LNT.HGZ. 2021-09-18T11:19:56.71 3.0 undecidable manual P 0
IV.HAGA.HHZ. 2021-09-18T11:19:55.63 0.1 undecidable manual P 114 0.2059 114 0 98
IV.HLNI.HHZ. 2021-09-18T11:19:55.76 0.3 undecidable manual S 240 0.0423 161 -0.21 73
IV.HCRL.HHZ. 2021-09-18T11:19:54.55 0.1 undecidable manual P 134 0.125 131 0.09 99
IV.HLNI.HHZ. 2021-09-18T11:19:53.76 0.1 undecidable manual P 240 0.0423 161 0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HLNI.HHE. ML:1.5 0.0003435 0.12 AML other m 2021-09-18T11:19:55.89
IV.HLNI.HHN. ML:1.4 0.0002575 1.38 AML other m 2021-09-18T11:19:56.22
IV.HCRL.HHN. ML:2 0.000716 0.24 AML other m 2021-09-18T11:19:57.47
IV.HCRL.HHE. ML:1.8 0.0004655 0.08 AML other m 2021-09-18T11:19:57.48
IV.SSY.HHE. ML:1.9 0.000388 0.38 AML other m 2021-09-18T11:20:00.68
IV.SSY.HHN. ML:2.1 0.000643 0.84 AML other m 2021-09-18T11:20:02.50
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