Earthquake with magnitude of ML 2.0 on date 21-04-2018 and time 15:58:24 (Italy) in region 3 km E Nissoria (EN)

A magnitude ML 2.0 earthquake occured in region: 3 km E Nissoria (EN), on

  • 21-04-2018 13:58:24 (UTC)
  • 21-04-2018 15:58:24 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 37.66, 14.48 at 41 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Nissoria EN 3 3000 3000
Agira EN 4 8345 11345
Assoro EN 6 5191 16536
Gagliano Castelferrato EN 8 3593 20129
Leonforte EN 8 13439 33568
Nicosia EN 12 13899 47467
Regalbuto EN 14 7277 54744
Sperlinga EN 16 805 55549
Cerami EN 17 2006 57555
Troina EN 18 9373 66928
Calascibetta EN 20 4528 71456
Valguarnera Caropepe EN 20 7866 79322

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km E of Caltanissetta (63360 inhabitants)
56 Km W of Catania (314555 inhabitants)
61 Km W of Acireale (52622 inhabitants)
69 Km N of Gela (75827 inhabitants)
79 Km N of Vittoria (63339 inhabitants)
85 Km N of Ragusa (73313 inhabitants)
88 Km E of Agrigento (59770 inhabitants)
93 Km N of Modica (54633 inhabitants)
97 Km SE of Bagheria (55387 inhabitants)
98 Km NW of Siracusa (122291 inhabitants)
Recent and historical Seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the last three days (72 hours)

Earthquakes of the last three days (72 hours) *

This map reports the earthquake epicenters located in the past 72 hours (3 days) from the time this page has been generated. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the last 90 days

Earthquakes of the last 90 days *

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1985

Earthquakes since 1985 *

This map reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Significant earthquakes since 1000 AD until 2006

Significant earthquakes since 1000 AD until 2006 *

This map shows the epicenters of the historical earthquakes catalogue CPT11 (Catalogo Parametrico dei Terremoti Italiani, 2011 version) with estimated magnitude ≥ 5.0 since 1000 AD until 2006. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows the epicenter of the current earthquake.
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 1000 ML 2.0 2018-04-21
13:58:24
37.66 14.48 41 2019-04-24
14:49:38
Bollettino Sismico Italiano INGV 58691341
Rev 100 ML 2.0 2018-04-21
13:58:24
37.66 14.47 48 2018-04-21
14:18:26
Sala Sismica INGV-Roma 55917641
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-04-21 13:58:24 ± 0.14
Latitude 37.66 ± 0.01
Longitude 14.48 ± 0.01
Depth (km) 41 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 58691341

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1000
Semi-minor axis of confidence ellipse (meter) 104
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 238
Circular confidence region, given by single value of horizontal uncertainty (meter) 1000
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 77
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 32
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.04227
Epicentral distance of station farthest from the epicenter (degree) 0.74194
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 21
Magnitudes information

ML:2

Field Value
Value 2
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 58691341
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-02-28 12:10:57

ML:2

Field Value
Value 2
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 55917641
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-04-21 14:18:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.HMDC.HHZ. 2018-04-21T13:58:49.82 0.3 undecidable manual S 161 0.7419 95 0.55 62
IV.AIO.HHN. 2018-04-21T13:58:47.92 0.3 undecidable manual S 62 0.6718 96 0.31 69
IV.HAGA.HHZ. 2018-04-21T13:58:47.11 0.3 undecidable manual S 125 0.6547 97 -0.09 71
IV.NOV.HHN. 2018-04-21T13:58:47.06 0.3 undecidable manual S 55 0.6358 97 0.29 70
IV.MEU.SHZ. 2018-04-21T13:58:46.84 0.6 undecidable manual S 153 0.616 98 0.56 43
IV.HVZN.HHE. 2018-04-21T13:58:44.22 0.3 undecidable manual S 159 0.5171 103 0.26 71
IV.MUCR.HHN. 2018-04-21T13:58:43.29 0.6 undecidable manual S 39 0.4937 105 -0.12 48
IV.RAFF.HHZ. 2018-04-21T13:58:43.92 0.6 undecidable manual S 192 0.447 109 1.58 27
IV.HLNI.HHZ. 2018-04-21T13:58:41.47 0.3 undecidable manual S 135 0.4407 109 -0.74 61
IV.ESML.HHE. 2018-04-21T13:58:40.04 0.3 undecidable manual S 97 0.3202 124 0.41 73
IV.HMDC.HHZ. 2018-04-21T13:58:38.53 0.1 undecidable manual P 161 0.7419 95 -0.17 93
IV.NOV.HHN. 2018-04-21T13:58:37.32 0.1 undecidable manual P 55 0.6358 97 0.07 96
IV.AIO.HHN. 2018-04-21T13:58:37.84 0.1 undecidable manual P 62 0.6718 96 0.1 95
IV.HAGA.HHZ. 2018-04-21T13:58:36.98 0.1 undecidable manual P 125 0.6547 97 -0.53 87
IV.MEU.SHZ. 2018-04-21T13:58:36.70 0.1 undecidable manual P 153 0.616 98 -0.27 93
IV.GIB.HHZ. 2018-04-21T13:58:35.18 0.1 undecidable manual P 313 0.4856 105 -0.04 100
IV.GALF.HHZ. 2018-04-21T13:58:35.95 0.6 undecidable manual S 54 0.0863 163 -0.34 49
IV.MUCR.HHN. 2018-04-21T13:58:35.05 0.1 undecidable manual P 39 0.4937 105 -0.27 95
IV.CMDO.HHZ. 2018-04-21T13:58:35.76 1.0 undecidable manual P 249 0.5549 100 -0.39 23
IV.HVZN.HHE. 2018-04-21T13:58:35.30 0.1 undecidable manual P 159 0.5171 103 -0.33 94
IV.ESLN.HHN. 2018-04-21T13:58:34.61 0.6 undecidable manual P 85 0.3939 115 0.59 45
IV.RAFF.HHZ. 2018-04-21T13:58:34.87 0.1 undecidable manual P 192 0.447 109 0.17 97
IV.CSLB.HHN. 2018-04-21T13:58:34.17 0.3 undecidable manual P 310 0.4326 110 -0.34 72
IV.EMSG.HHN. 2018-04-21T13:58:34.67 0.3 undecidable manual P 67 0.4056 113 0.51 69
IV.EPZF.HHZ. 2018-04-21T13:58:34.06 0.3 undecidable manual P 61 0.3408 121 0.69 66
IV.ESML.HHE. 2018-04-21T13:58:33.10 0.3 undecidable manual P 97 0.3202 124 -0.03 77
IV.HLNI.HHZ. 2018-04-21T13:58:33.84 0.1 undecidable manual P 135 0.4407 109 -0.78 82
IV.PLLN.EHZ. 2018-04-21T13:58:33.82 0.6 undecidable manual P 322 0.4245 111 -0.59 45
IV.PETRA.HHZ. 2018-04-21T13:58:33.19 0.3 undecidable manual P 301 0.3354 122 -0.12 77
IV.RESU.HHZ. 2018-04-21T13:58:33.94 0.3 undecidable manual P 268 0.3336 122 0.65 65
IV.CAGR.HHZ. 2018-04-21T13:58:31.34 0.3 undecidable manual P 156 0.0423 172 0.27 79
IV.GALF.HHZ. 2018-04-21T13:58:30.74 0.3 undecidable manual P 54 0.0863 163 -0.47 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.HLNI.HHN. ML:1.8 0.00012094645 0.0832 AML other m 2018-04-21T13:58:42.49
IV.HLNI.HHE. ML:1.8 0.0001233859 0.224 AML other m 2018-04-21T13:58:45.23
IV.RAFF.HHE. ML:2 0.00019218315 0.2176 AML other m 2018-04-21T13:58:45.68
IV.RAFF.HHN. ML:1.8 0.0001235447 0.2176 AML other m 2018-04-21T13:58:46.17
IV.HAGA.HHE. ML:2.1 0.00017012815 0.2176 AML other m 2018-04-21T13:58:47.70
IV.HAGA.HHN. ML:2.1 0.00017368975 0.1408 AML other m 2018-04-21T13:58:47.53
IV.MEU.SHE. ML:0 0.00014735025 0.32 AML other m 2018-04-21T13:58:50.07
IV.HMDC.HHE. ML:2.1 0.00013912975 0.1792 AML other m 2018-04-21T13:58:51.62
IV.HMDC.HHN. ML:2.1 0.0001383743 0.2048 AML other m 2018-04-21T13:58:52.19
IV.MEU.SHN. ML:0 0.00020045965 0.2368 AML other m 2018-04-21T13:58:52.61
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Focal Mechanisms

Focal Mechanisms *

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://cnt.rm.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol scales with the calculated moment magnitude, Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in full SEED format Download