INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 2.6 on date 21-04-2017 and time 01:25:03 (Italy) in region Tirreno Meridionale (MARE)

A magnitude ML 2.6 earthquake occured in region: Tirreno Meridionale (MARE), on

  • 20-04-2017 23:25:03 (UTC)
  • 21-04-2017 01:25:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 38.77, 14.03 at 30 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

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to
90 Km NE of Bagheria (55387 inhabitants)
94 Km NE of Palermo (674435 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 Date and Time (UTC) Latitude Longitude Magnitude Depth (km) Published time (UTC) Author Location ID
Rev 100 2017-04-20
23:25:03
38.78 14.02 ML 2.7 10 2017-04-20
23:39:18
Sala Sismica INGV-Roma 44155631
Rev 1000 2017-04-20
23:25:03
38.77 14.03 ML 2.6 30 2018-01-10
09:56:12
Bollettino Sismico Italiano INGV 48770761
Best location and best magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-04-20 23:25:03 ± 0.12
Latitude 38.77 ± 0.01
Longitude 14.03 ± 0.01
Depth (km) 30 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 48770761

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 644
Semi-minor axis of confidence ellipse (meter) 520
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 269
Circular confidence region, given by single value of horizontal uncertainty (meter) 640
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 127
Number of associated phases, regardless of their use for origin computation 35
Number of defining phases 35
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.34804
Epicentral distance of station farthest from the epicenter (degree) 1.82742
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 22
Magnitudes information

ML:2.6

Field Value
Value 2.6
Uncertainty 0.3
Num. used stations 19
Type of magnitude ML
Reference to an origin 48770761
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2017-08-07 10:17:23

ML:2.7

Field Value
Value 2.7
Uncertainty 0.4
Num. used stations 16
Type of magnitude ML
Reference to an origin 44155631
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-04-20 23:39:18
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CMPR.HHZ. 2017-04-20T23:25:55.35 0.6 undecidable manual S 32 1.8274 54 0.11 32
IV.CAR1.HHZ. 2017-04-20T23:25:53.22 0.6 undecidable manual S 74 1.7582 54 -0.38 32
IV.ALJA.HHZ. 2017-04-20T23:25:36.85 0.6 undecidable manual S 192 1.0477 54 0.26 45
IV.MUCR.HHZ. 2017-04-20T23:25:34.63 0.6 undecidable manual S 138 0.9839 54 -0.43 43
IV.PETRA.HHZ. 2017-04-20T23:25:34.65 0.6 undecidable manual S 176 0.9425 101 0.77 39
IV.CMPR.HHZ. 2017-04-20T23:25:33.52 0.6 undecidable manual P 32 1.8274 54 0.36 31
IV.CAR1.HHZ. 2017-04-20T23:25:32.66 0.1 undecidable manual P 74 1.7582 54 0.44 63
IV.IVPL.HHZ. 2017-04-20T23:25:31.64 0.6 undecidable manual S 118 0.84 103 0.71 40
IV.CSLB.HHZ. 2017-04-20T23:25:31.06 0.6 undecidable manual S 179 0.8364 103 0.25 47
IV.MSFR.HHZ. 2017-04-20T23:25:31.37 0.6 undecidable manual S 149 0.8598 103 -0.12 47
IV.PLLN.EHZ. 2017-04-20T23:25:29.49 0.3 undecidable manual S 174 0.786 104 0.13 73
IV.GIB.HHZ. 2017-04-20T23:25:29.28 0.3 undecidable manual S 180 0.7833 104 -0.01 73
IV.JOPP.HHZ. 2017-04-20T23:25:27.68 0.3 undecidable manual P 96 1.4551 54 -0.34 58
IV.USI.HHZ. 2017-04-20T23:25:25.96 0.6 undecidable manual S 265 0.6682 107 -0.05 49
IV.GALF.HHZ. 2017-04-20T23:25:24.38 0.3 undecidable manual P 158 1.1421 54 0.68 58
IV.AIO.HHZ. 2017-04-20T23:25:24.87 0.3 undecidable manual P 130 1.2366 54 -0.13 65
IV.MSRU.HHZ. 2017-04-20T23:25:24.80 0.6 undecidable manual P 113 1.2617 54 -0.55 39
IV.NOV.HHZ. 2017-04-20T23:25:23.45 0.3 undecidable manual P 130 1.1421 54 -0.25 65
IV.ALJA.HHZ. 2017-04-20T23:25:22.67 0.3 undecidable manual P 192 1.0477 54 0.28 66
IV.MNO.SHZ. 2017-04-20T23:25:21.95 0.3 undecidable manual P 148 0.9902 54 0.36 66
IV.MUCR.HHZ. 2017-04-20T23:25:21.12 0.1 undecidable manual P 138 0.9839 54 -0.4 87
IV.PETRA.HHZ. 2017-04-20T23:25:20.92 0.3 undecidable manual P 176 0.9425 101 0.09 71
IV.IST3.HHZ. 2017-04-20T23:25:20.69 0.3 undecidable manual P 88 0.9335 102 0.01 71
IV.ISTR.HHZ. 2017-04-20T23:25:20.64 1.0 undecidable manual P 89 0.9029 102 0.47 22
IV.IFIL.HHZ. 2017-04-20T23:25:20.97 0.6 undecidable manual S 116 0.473 114 0.41 48
IV.IVPL.HHZ. 2017-04-20T23:25:19.14 0.3 undecidable manual P 118 0.84 103 0.02 73
IV.CSLB.HHZ. 2017-04-20T23:25:18.61 0.3 undecidable manual P 179 0.8364 103 -0.45 66
IV.MSFR.HHZ. 2017-04-20T23:25:18.98 0.3 undecidable manual P 149 0.8598 103 -0.47 66
IV.PLLN.EHZ. 2017-04-20T23:25:18.11 0.6 undecidable manual P 174 0.786 104 -0.11 48
IV.ILLI.HHZ. 2017-04-20T23:25:18.28 1.0 undecidable manual P 114 0.7869 104 0.05 24
IV.GIB.HHZ. 2017-04-20T23:25:18.23 0.6 undecidable manual P 180 0.7833 104 0.05 49
IV.USI.HHZ. 2017-04-20T23:25:16.14 0.6 undecidable manual P 265 0.6682 107 -0.14 49
IV.IACL.HHZ. 2017-04-20T23:25:16.94 0.6 undecidable manual S 134 0.348 123 -0.38 50
IV.IFIL.HHZ. 2017-04-20T23:25:13.48 0.3 undecidable manual P 116 0.473 114 0.34 74
IV.IACL.HHZ. 2017-04-20T23:25:10.89 0.1 undecidable manual P 134 0.348 123 -0.37 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.AIO.HHE. ML:2.2 9.1537305E-5 0.2432 AML other m 2017-04-20T23:25:46.39
IV.AIO.HHN. ML:2.5 0.0001632548 0.3968 AML other m 2017-04-20T23:25:48.73
IV.ALJA.HHN. ML:2.5 0.00024181565 0.448 AML other m 2017-04-20T23:25:47.10
IV.ALJA.HHE. ML:2.4 0.00020406975 0.6656 AML other m 2017-04-20T23:25:46.01
IV.CAR1.HHN. ML:2.6 0.00011432905 0.3328 AML other m 2017-04-20T23:25:54.88
IV.CAR1.HNN. ML:2.8 0.0001966995 0.384 AML other m 2017-04-20T23:25:55.20
IV.CAR1.HHE. ML:2.6 0.00013383339 0.3328 AML other m 2017-04-20T23:25:56.82
IV.CAR1.HNE. ML:2.6 0.0001368328 0.96 AML other m 2017-04-20T23:26:00.13
IV.CSLB.HHE. ML:2.2 0.00017299945 0.3328 AML other m 2017-04-20T23:25:34.84
IV.CSLB.HHN. ML:2.5 0.0003083296 0.6016 AML other m 2017-04-20T23:25:35.10
IV.EMSG.HHN. ML:0 0.000831845 0.768 AML other m 2017-04-20T23:25:43.99
IV.EMSG.HHE. ML:0 0.0007174163 0.4608 AML other m 2017-04-20T23:25:43.87
IV.EPZF.HHN. ML:0 0.000477962 1.0624 AML other m 2017-04-20T23:25:27.76
IV.EPZF.HHE. ML:0 0.0004601429 1.2672 AML other m 2017-04-20T23:25:53.68
IV.GALF.HHN. ML:2.4 0.0001433646 0.6784 AML other m 2017-04-20T23:25:50.11
IV.GALF.HHE. ML:2.4 0.0001684508 0.6656 AML other m 2017-04-20T23:25:55.33
IV.GIB.HHE. ML:2.8 0.00071161435 0.448 AML other m 2017-04-20T23:25:34.43
IV.GIB.HHN. ML:2.9 0.00097381835 0.6784 AML other m 2017-04-20T23:25:33.93
IV.GMB.BHE. ML:0 0.0001624673 0.5248 AML other m 2017-04-20T23:25:57.24
IV.GMB.BHN. ML:0 0.0001506894 0.3968 AML other m 2017-04-20T23:25:56.58
IV.HLNI.HHE. ML:0 5.5602435E-5 0.4608 AML other m 2017-04-20T23:26:00.20
IV.HLNI.HHN. ML:0 6.114361E-5 0.1664 AML other m 2017-04-20T23:25:31.83
IV.IACL.HHN. ML:3.2 0.0040989395 0.1792 AML other m 2017-04-20T23:25:19.58
IV.IACL.HHE. ML:3.1 0.003826705 0.1408 AML other m 2017-04-20T23:25:20.12
IV.IFIL.HHN. ML:3 0.0019767245 0.3456 AML other m 2017-04-20T23:25:27.75
IV.IFIL.HHE. ML:3.5 0.0060870145 0.2816 AML other m 2017-04-20T23:25:26.99
IV.ILLI.HHE. ML:2.9 0.00092315625 0.4608 AML other m 2017-04-20T23:25:37.54
IV.ILLI.HHN. ML:3 0.00122714 0.5632 AML other m 2017-04-20T23:25:42.09
IV.IST3.HHN. ML:2.6 0.00032184055 0.2176 AML other m 2017-04-20T23:25:39.91
IV.IST3.HHE. ML:2.4 0.0002285423 0.1792 AML other m 2017-04-20T23:25:36.56
IV.JOPP.HHE. ML:2 4.452236E-5 0.8064 AML other m 2017-04-20T23:25:58.24
IV.JOPP.HHN. ML:2.1 4.8904985E-5 0.96 AML other m 2017-04-20T23:26:04.78
IV.MNO.SHE. ML:0 0.00035384705 0.6784 AML other m 2017-04-20T23:25:40.08
IV.MNO.SHN. ML:0 0.000280264 0.5248 AML other m 2017-04-20T23:25:42.16
IV.MODR.HHE. ML:0 4.954605E-5 1.4464 AML other m 2017-04-20T23:26:27.82
IV.MODR.HHN. ML:0 6.8171925E-5 0.8448 AML other m 2017-04-20T23:26:29.54
IV.MSFR.HHE. ML:2.1 0.00011806145 0.4608 AML other m 2017-04-20T23:25:32.75
IV.MSFR.HHN. ML:2 9.349431E-5 0.384 AML other m 2017-04-20T23:25:39.47
IV.MSRU.HHN. ML:2.3 0.00011836974 0.4096 AML other m 2017-04-20T23:25:47.17
IV.MSRU.HHE. ML:2.5 0.00018555795 0.8064 AML other m 2017-04-20T23:25:30.55
IV.MUCR.HHE. ML:2.6 0.00032621085 0.5632 AML other m 2017-04-20T23:25:41.10
IV.MUCR.HHN. ML:2.8 0.0005425109 0.512 AML other m 2017-04-20T23:25:39.98
IV.NOV.HHN. ML:2.5 0.00020892475 0.384 AML other m 2017-04-20T23:25:48.44
IV.NOV.HHE. ML:2.6 0.0002570942 0.512 AML other m 2017-04-20T23:25:43.08
IV.PETRA.HHN. ML:2.8 0.00053073325 0.64 AML other m 2017-04-20T23:25:37.66
IV.PETRA.HHE. ML:2.8 0.00049020035 0.4224 AML other m 2017-04-20T23:25:40.81
IV.PLLN.EHE. ML:2.7 0.0006388468 0.7168 AML other m 2017-04-20T23:25:34.02
IV.PLLN.EHN. ML:3 0.00106416055 0.4992 AML other m 2017-04-20T23:25:37.56
IV.PTRJ.HHN. ML:0 0.0011518887 0.1152 AML other m 2017-04-20T23:26:25.40
IV.PTRJ.HNE. ML:0 0.0008292433 0.1024 AML other m 2017-04-20T23:26:26.87
IV.PTRJ.HHE. ML:0 0.0006147226 0.1024 AML other m 2017-04-20T23:26:23.88
IV.PTRJ.HNN. ML:0 0.0010442931 0.0896 AML other m 2017-04-20T23:26:25.43
IV.USI.HHE. ML:2.1 0.0001839118 0.64 AML other m 2017-04-20T23:25:40.35
IV.USI.HHN. ML:2.7 0.00066147855 0.3584 AML other m 2017-04-20T23:25:35.14
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