Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 18-02-2021 and time 21:55:35 (Italy) in region 4 km SE Lecce nei Marsi (AQ)

A magnitude ML 1.6 earthquake occured in region: 4 km SE Lecce nei Marsi (AQ), on

  • 18-02-2021 20:55:35 (UTC)
  • 18-02-2021 21:55:35 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.9050, 13.7160 at 16 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
Lecce nei Marsi AQ 4 1702 1702
Bisegna AQ 4 223 1925
Gioia dei Marsi AQ 6 1989 3914
Ortucchio AQ 8 1860 5774
Villavallelonga AQ 9 919 6693
Ortona dei Marsi AQ 11 542 7235
Villalago AQ 11 568 7803
Collelongo AQ 11 1233 9036
Pescasseroli AQ 12 2203 11239
Anversa degli Abruzzi AQ 12 341 11580
San Benedetto dei Marsi AQ 14 3909 15489
Scanno AQ 14 1847 17336
Pescina AQ 14 4133 21469
Cocullo AQ 15 230 21699
Trasacco AQ 16 6246 27945
Balsorano AQ 17 3569 31514
Opi AQ 17 420 31934
San Vincenzo Valle Roveto AQ 18 2347 34281
Bugnara AQ 18 1125 35406
Pescosolido FR 18 1555 36961
Campoli Appennino FR 19 1725 38686
Collarmele AQ 19 894 39580
Introdacqua AQ 19 2126 41706
Prezza AQ 20 945 42651

Municipalities with at least 50000 inhabitants

An earthquake occurred to
56 Km SE of L'Aquila (69753 inhabitants)
62 Km SW of Chieti (51815 inhabitants)
75 Km SW of Pescara (121014 inhabitants)
76 Km E of Tivoli (56533 inhabitants)
77 Km SW of Montesilvano (53738 inhabitants)
81 Km E of Velletri (53303 inhabitants)
82 Km E of Guidonia Montecelio (88673 inhabitants)
83 Km NE of Latina (125985 inhabitants)
84 Km S of Teramo (54892 inhabitants)
95 Km E of Aprilia (73446 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 1.6 2021-02-18
20:55:35		 41.9053 13.7155 16 2021-07-12
16:55:03		 Bollettino Sismico Italiano INGV 88409221
Reviewed
Rev100 		ML 1.5 2021-02-18
20:55:35		 41.9052 13.7153 15 2021-02-18
21:02:02		 Sala Sismica INGV-Roma 87284991
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-18 20:55:35 ± 0.07
Latitude 41.9053 ± 0.0027
Longitude 13.7155 ± 0.0048
Depth (km) 16 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 88409221

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 359
Semi-minor axis of confidence ellipse (meter) 54
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 107
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 54
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 34
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.07734
Epicentral distance of station farthest from the epicenter (degree) 0.48833
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 17
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 26
Type of magnitude ML
Reference to an origin 88409221
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-18 17:20:13

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 26
Type of magnitude ML
Reference to an origin 87284991
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-18 21:02:02
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MIDA.HHZ. 2021-02-18T20:55:52.57 0.6 undecidable manual S 123 53.3022 96 0.29 44
IV.GIUL.HHZ. 2021-02-18T20:55:52.92 0.6 undecidable manual S 225 54.2013 96 0.39 43
IV.RNI2.HHZ. 2021-02-18T20:55:50.84 0.6 undecidable manual S 122 42.5241 98 1.41 28
IV.FAGN.HHZ. 2021-02-18T20:55:49.46 0.6 undecidable manual S 345 41.4252 99 0.32 45
IV.CERA.HHZ. 2021-02-18T20:55:49.51 0.6 undecidable manual S 144 42.3243 98 0.12 46
IV.LPEL.HHZ. 2021-02-18T20:55:48.74 0.3 undecidable manual S 68 41.625 99 -0.46 64
IV.T0110.HHZ. 2021-02-18T20:55:48.58 0.6 undecidable manual S 8 36.3414 101 0.79 40
IV.GUAR.HHZ. 2021-02-18T20:55:47.42 0.6 undecidable manual S 250 35.5422 101 -0.17 47
IV.LRP.EHZ. 2021-02-18T20:55:46.32 0.6 undecidable manual S 200 30.5472 104 0.02 48
IV.PTQR.HHZ. 2021-02-18T20:55:46.21 0.6 undecidable manual S 297 29.0487 105 0.32 46
IT.SULA.HNZ. 2021-02-18T20:55:45.13 0.6 undecidable manual S 42 24.9528 108 0.28 47
IV.GIUL.HHZ. 2021-02-18T20:55:45.24 0.1 undecidable manual P 225 54.2013 96 -0.11 92
IT.SULP.HGE. 2021-02-18T20:55:45.25 0.6 undecidable manual S 41 26.4513 107 0 48
IV.MIDA.HHZ. 2021-02-18T20:55:45.04 0.1 negative manual P 123 53.3022 96 -0.17 90
IT.SULC.HNN. 2021-02-18T20:55:44.62 0.6 undecidable manual S 41 24.0537 109 -0.02 48
IV.RNI2.HHZ. 2021-02-18T20:55:43.94 0.3 undecidable manual P 122 42.5241 98 0.38 66
IV.INTR.HHZ. 2021-02-18T20:55:43.24 0.1 undecidable manual S 53 19.5693 116 -0.27 93
IV.FAGN.HHZ. 2021-02-18T20:55:43.18 0.1 undecidable manual P 345 41.4252 99 -0.21 91
IV.POFI.HHE. 2021-02-18T20:55:43.79 0.6 undecidable manual S 181 20.868 114 -0.04 50
IV.LPEL.HHZ. 2021-02-18T20:55:43.17 0.1 undecidable manual P 68 41.625 99 -0.25 90
IV.CERA.HHZ. 2021-02-18T20:55:43.32 0.1 undecidable manual P 144 42.3243 98 -0.21 91
IT.OPI.HGN. 2021-02-18T20:55:42.84 0.3 undecidable manual S 146 17.1717 121 -0.12 74
IV.T0110.HHZ. 2021-02-18T20:55:42.56 0.1 positive manual P 8 36.3414 101 -0.05 94
IV.GUAR.HHZ. 2021-02-18T20:55:42.47 0.3 undecidable manual P 250 35.5422 101 -0.03 72
IV.PTQR.HHZ. 2021-02-18T20:55:41.53 0.1 undecidable manual P 297 29.0487 105 0.01 98
IT.SULP.HGE. 2021-02-18T20:55:41.13 0.1 undecidable manual P 41 26.4513 107 -0.01 97
IV.VVLD.HHZ. 2021-02-18T20:55:41.04 0.1 undecidable manual S 243 8.5803 145 -0.22 98
IV.LRP.EHZ. 2021-02-18T20:55:41.74 0.1 undecidable manual P 200 30.5472 104 -0.01 97
IT.SULC.HNN. 2021-02-18T20:55:40.83 0.1 undecidable manual P 41 24.0537 109 0.04 98
IT.SULA.HNZ. 2021-02-18T20:55:40.90 0.1 undecidable manual P 42 24.9528 108 -0.02 97
IV.INTR.HHZ. 2021-02-18T20:55:40.18 0.1 positive manual P 53 19.5693 116 0.04 99
IV.POFI.HHE. 2021-02-18T20:55:40.39 0.1 undecidable manual P 181 20.868 114 0.06 98
IT.OPI.HGN. 2021-02-18T20:55:39.84 0.1 negative manual P 146 17.1717 121 0.02 99
IV.VVLD.HHZ. 2021-02-18T20:55:38.90 0.1 negative manual P 243 8.5803 145 0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VVLD.HHE. ML:1.8 0.0005769999999999999 0.22 AML other m 2021-02-18T20:55:41.09
IV.VVLD.HHN. ML:1.4 0.00027100000000000003 0.52 AML other m 2021-02-18T20:55:41.21
IV.INTR.HHE. ML:1.8 0.00041549999999999996 0.56 AML other m 2021-02-18T20:55:43.69
IV.INTR.HNE. ML:1.8 0.000423 0.98 AML other m 2021-02-18T20:55:44.69
IV.INTR.HHN. ML:1.9 0.0004905 0.12 AML other m 2021-02-18T20:55:44.31
IV.INTR.HNN. ML:1.9 0.00046699999999999997 1.18 AML other m 2021-02-18T20:55:46.03
IV.LRP.EHE. ML:1.8 0.000257 0.22 AML other m 2021-02-18T20:55:46.66
IV.LRP.EHN. ML:1.4 0.00009945 0.64 AML other m 2021-02-18T20:55:46.91
IV.PTQR.HHN. ML:0.9 0.0000336 1.74 AML other m 2021-02-18T20:55:47.97
IV.PTQR.HHE. ML:0.9 0.0000352 1.5 AML other m 2021-02-18T20:55:47.17
IV.T0110.HHN. ML:1.5 0.00011175 0.88 AML other m 2021-02-18T20:55:48.95
IV.LPEL.HHN. ML:1.6 0.00012509999999999998 0.18 AML other m 2021-02-18T20:55:49.14
IV.LPEL.HNN. ML:1.7 0.00015208644999999997 0.2048 AML other m 2021-02-18T20:55:49.04
IV.CERA.HHN. ML:1.4 0.0000693 0.32 AML other m 2021-02-18T20:55:49.63
IV.T0110.HHE. ML:1.6 0.0001285 0.96 AML other m 2021-02-18T20:55:50.37
IV.LPEL.HHE. ML:1.6 0.00013000000000000002 1 AML other m 2021-02-18T20:55:50.99
IV.LPEL.HNE. ML:1.6 0.00012711635 0.2432 AML other m 2021-02-18T20:55:50.72
IV.CERA.HHE. ML:1.2 0.000057400000000000006 1.12 AML other m 2021-02-18T20:55:51.63
IV.RNI2.HHN. ML:1.4 0.00008205000000000002 0.22 AML other m 2021-02-18T20:55:51.82
IV.RNI2.HNN. ML:1.4 0.00007782288 0.2304 AML other m 2021-02-18T20:55:51.83
IV.RNI2.HHE. ML:1.7 0.00014150000000000002 1.82 AML other m 2021-02-18T20:55:52.04
IV.RNI2.HNE. ML:1.6 0.000132800095 1.8208 AML other m 2021-02-18T20:55:52.96
IV.FAGN.HHE. ML:1.6 0.000118 0.36 AML other m 2021-02-18T20:55:52.87
IV.MIDA.HHE. ML:1.4 0.00005435 0.32 AML other m 2021-02-18T20:55:53.55
IV.MIDA.HHN. ML:1.4 0.00006345 0.76 AML other m 2021-02-18T20:55:53.34
IV.FAGN.HHN. ML:1.4 0.00007664999999999999 0.24 AML other m 2021-02-18T20:55:54.45
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