Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 18-04-2021 and time 06:04:53 (UTC) in region 5 km W Amatrice (RI)

A magnitude ML 1.1 earthquake occured in region: 5 km W Amatrice (RI), on

  • 18-04-2021 06:04:53 (UTC)
  • 18-04-2021 08:04:53 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6510, 13.2390 at 12 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
Amatrice RI 5 2657 2657
Accumoli RI 5 667 3324
Cittareale RI 7 482 3806
Montereale AQ 14 2581 6387
Arquata del Tronto AP 15 1178 7565
Campotosto AQ 15 542 8107
Capitignano AQ 15 665 8772
Borbona RI 18 617 9389
Posta RI 18 694 10083
Acquasanta Terme AP 19 2916 12999
Norcia PG 20 4957 17956
Cascia PG 20 3217 21173

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km NW of L'Aquila (69753 inhabitants)
38 Km W of Teramo (54892 inhabitants)
49 Km E of Terni (111501 inhabitants)
55 Km SE of Foligno (57155 inhabitants)
76 Km W of Montesilvano (53738 inhabitants)
83 Km W of Pescara (121014 inhabitants)
83 Km W of Chieti (51815 inhabitants)
84 Km NE of Guidonia Montecelio (88673 inhabitants)
85 Km NE of Tivoli (56533 inhabitants)
86 Km SE of Perugia (166134 inhabitants)
96 Km E of Viterbo (67173 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 1.1 2021-04-18
06:04:53		 42.651 13.2388 12 2021-07-12
16:55:11		 Bollettino Sismico Italiano INGV 90089901
Reviewed
Rev100 		ML 1.1 2021-04-18
06:04:53		 42.6558 13.2383 12 2021-04-18
06:10:08		 Sala Sismica INGV-Roma 89202831
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-18 06:04:53 ± 0.05
Latitude 42.6510 ± 0.0027
Longitude 13.2388 ± 0.0037
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90089901

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 291
Semi-minor axis of confidence ellipse (meter) 171
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 306
Circular confidence region, given by single value of horizontal uncertainty (meter) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 69
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.03597
Epicentral distance of station farthest from the epicenter (degree) 0.51441
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 90089901
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-14 12:13:16

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 89202831
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-18 06:10:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MOMA.HNZ. 2021-04-18T06:05:11.25 0.6 undecidable manual S 288 57.0984 91 0.24 45
IV.FIAM.HNN. 2021-04-18T06:05:07.09 0.6 undecidable manual S 193 43.623 92 -0.34 45
IV.MOMA.HNZ. 2021-04-18T06:05:03.47 0.1 undecidable manual P 288 57.0984 91 -0.06 92
IV.MC2.EHZ. 2021-04-18T06:05:03.84 0.6 undecidable manual S 352 29.1486 94 0.27 47
IV.GAVE.EHZ. 2021-04-18T06:05:03.38 0.3 undecidable manual S 279 28.4493 94 0 74
IV.TERO.HHZ. 2021-04-18T06:05:03.62 0.1 undecidable manual S 96 29.9478 94 -0.16 96
IV.NRCA.HHZ. 2021-04-18T06:05:01.52 0.3 undecidable manual S 333 22.6551 96 -0.32 70
IV.FIAM.HNN. 2021-04-18T06:05:01.41 0.6 undecidable manual P 193 43.623 92 -0.05 48
IV.LNSS.HHZ. 2021-04-18T06:05:00.23 0.3 undecidable manual S 252 17.0718 103 -0.14 73
IV.MTRA.EHZ. 2021-04-18T06:05:00.24 0.3 undecidable manual S 48 17.3715 103 -0.21 73
IV.TERO.HHZ. 2021-04-18T06:04:59.36 0.1 undecidable manual P 96 29.9478 94 0 98
IV.MC2.EHZ. 2021-04-18T06:04:59.45 0.3 undecidable manual P 352 29.1486 94 0.21 71
IV.RM33.EHZ. 2021-04-18T06:04:59.97 0.3 undecidable manual S 187 15.873 106 -0.09 75
IV.GAVE.EHZ. 2021-04-18T06:04:59.04 0.1 undecidable manual P 279 28.4493 94 -0.09 97
IV.SMA1.EHZ. 2021-04-18T06:04:58.41 0.3 undecidable manual S 106 8.1807 135 0.12 74
IV.NRCA.HHZ. 2021-04-18T06:04:58.24 0.3 negative manual P 333 22.6551 96 0 75
IV.RM33.EHZ. 2021-04-18T06:04:57.35 0.3 undecidable manual P 187 15.873 106 0.14 74
IV.MTRA.EHZ. 2021-04-18T06:04:57.53 0.1 undecidable manual P 48 17.3715 103 0.09 99
IV.LNSS.HHZ. 2021-04-18T06:04:57.44 0.1 undecidable manual P 252 17.0718 103 0.05 100
IV.T1299.HNZ. 2021-04-18T06:04:57.41 0.1 undecidable manual S 118 3.996 157 -0.25 99
IV.T1299.HNZ. 2021-04-18T06:04:56.00 0.1 undecidable manual P 118 3.996 157 0.17 99
IV.SMA1.EHZ. 2021-04-18T06:04:56.50 0.1 undecidable manual P 106 8.1807 135 0.31 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:1.2 0.0001895 0.24 AML other m 2021-04-18T06:04:58.87
IV.SMA1.EHE. ML:1.5 0.000382 1.76 AML other m 2021-04-18T06:04:58.01
IV.MTRA.EHN. ML:1.1 0.00010205 0.12 AML other m 2021-04-18T06:05:00.38
IV.MTRA.EHE. ML:1.0 0.00007875 0.68 AML other m 2021-04-18T06:05:00.55
IV.NRCA.HHN. ML:1.3 0.0001175 0.12 AML other m 2021-04-18T06:05:01.62
IV.NRCA.HHE. ML:1.2 0.00009224999999999999 0.12 AML other m 2021-04-18T06:05:01.80
IV.TERO.HHN. ML:0.9 0.000039699999999999996 0.06 AML other m 2021-04-18T06:05:03.73
IV.TERO.HHE. ML:0.7 0.000023800000000000003 0.06 AML other m 2021-04-18T06:05:03.78
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