INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 1.1 on date 13-08-2018 and time 02:30:37 (Italy) in region 5 km E Mazzarrone (CT)

A magnitude ML 1.1 earthquake occured in region: 5 km E Mazzarrone (CT), on

  • 13-08-2018 00:30:37 (UTC)
  • 13-08-2018 02:30:37 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.06, 14.61 at 30 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
Mazzarrone CT 5 4078 4078
Chiaramonte Gulfi RG 9 8238 12316
Acate RG 11 10954 23270
Licodia Eubea CT 13 3081 26351
Comiso RG 13 30156 56507
Monterosso Almo RG 14 3032 59539
Vittoria RG 14 63339 122878
Giarratana RG 16 3048 125926
Vizzini CT 16 6241 132167
Grammichele CT 17 13418 145585
Ragusa RG 19 73313 218898

Municipalities with at least 50000 inhabitants

An earthquake occurred to
14 Km NE of Vittoria (63339 inhabitants)
19 Km NW of Ragusa (73313 inhabitants)
26 Km NW of Modica (54633 inhabitants)
32 Km E of Gela (75827 inhabitants)
60 Km W of Siracusa (122291 inhabitants)
64 Km SW of Catania (314555 inhabitants)
68 Km SE of Caltanissetta (63360 inhabitants)
78 Km SW of Acireale (52622 inhabitants)
95 Km E of Agrigento (59770 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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
Rev 100 ML 1.1 2018-08-13
00:30:37
37.07 14.61 30 2018-08-13
01:41:14
Sala Sismica INGV-Roma 59698031
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-08-13 00:30:37 ± 0.54
Latitude 37.07 ± 0.03
Longitude 14.61 ± 0.02
Depth (km) 30 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 59698031

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2779
Semi-minor axis of confidence ellipse (meter) 675
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 186
Circular confidence region, given by single value of horizontal uncertainty (meter) 2780
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 180
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) 0.36
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.48384
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:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 59698031
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-08-13 01:41:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ILLI.HHZ. 2018-08-13T00:31:05.54 3.0 positive manual P 0.22 0
IV.HAGA.HHZ. 2018-08-13T00:30:55.72 0.6 undecidable manual S 63 0.4838 114 0.06 48
IV.SSY.HHZ. 2018-08-13T00:30:53.30 0.3 undecidable manual S 76 0.3786 121 0.42 68
IV.HLNI.HHZ. 2018-08-13T00:30:51.38 0.6 undecidable manual S 36 0.3498 123 -0.79 47
IV.RAFF.HHZ. 2018-08-13T00:30:50.52 0.6 undecidable manual S 308 0.2545 133 0.6 45
IV.HAGA.HHZ. 2018-08-13T00:30:48.07 0.1 undecidable manual P 63 0.4838 114 -0.02 100
IV.HMDC.HHZ. 2018-08-13T00:30:47.90 0.6 undecidable manual S 128 0.1718 145 -0.41 48
IV.SSY.HHZ. 2018-08-13T00:30:46.81 0.1 positive manual P 76 0.3786 121 0.32 97
IV.HLNI.HHZ. 2018-08-13T00:30:45.75 0.1 positive manual P 36 0.3498 123 -0.32 98
IV.RAFF.HHZ. 2018-08-13T00:30:44.83 0.3 negative manual P 308 0.2545 133 0.05 78
IV.HMDC.HHZ. 2018-08-13T00:30:43.75 0.3 positive manual P 128 0.1718 145 -0.1 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HMDC.HHE. ML:1.4 9.88E-5 1.84 AML other m 2018-08-13T00:30:48.97
IV.HMDC.HHN. ML:1.2 6.74E-5 1.68 AML other m 2018-08-13T00:30:48.15
IV.RAFF.HHN. ML:0.9 2.675E-5 0.3 AML other m 2018-08-13T00:30:50.79
IV.RAFF.HHE. ML:0.8 1.9795E-5 1.2 AML other m 2018-08-13T00:30:51.83
IV.HLNI.HHE. ML:1.3 6.225E-5 0.16 AML other m 2018-08-13T00:30:51.54
IV.HLNI.HHN. ML:1 3.185E-5 0.7 AML other m 2018-08-13T00:30:51.99
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download