Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.6 on date 18-04-2021 and time 06:15:57 (Italy) in region 5 km N Accumoli (RI)

A magnitude ML 0.6 earthquake occured in region: 5 km N Accumoli (RI), on

  • 18-04-2021 04:15:57 (UTC)
  • 18-04-2021 06:15:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7380, 13.2630 at 11 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
Accumoli RI 5 667 667
Arquata del Tronto AP 5 1178 1845
Amatrice RI 12 2657 4502
Acquasanta Terme AP 13 2916 7418
Montegallo AP 13 523 7941
Norcia PG 15 4957 12898
Cittareale RI 16 482 13380
Montemonaco AP 19 604 13984
Valle Castellana TE 19 977 14961
Castelsantangelo sul Nera MC 20 281 15242

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km W of Teramo (54892 inhabitants)
44 Km N of L'Aquila (69753 inhabitants)
52 Km E of Foligno (57155 inhabitants)
54 Km E of Terni (111501 inhabitants)
77 Km W of Montesilvano (53738 inhabitants)
82 Km SE of Perugia (166134 inhabitants)
84 Km W of Pescara (121014 inhabitants)
86 Km NW of Chieti (51815 inhabitants)
93 Km NE of Guidonia Montecelio (88673 inhabitants)
94 Km NE of Tivoli (56533 inhabitants)
100 Km S of Ancona (100861 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 0.6 2021-04-18
04:15:57		 42.7382 13.2627 11 2021-07-12
16:55:11		 Bollettino Sismico Italiano INGV 90077741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-18 04:15:57 ± 0.04
Latitude 42.7382 ± 0.0027
Longitude 13.2627 ± 0.0049
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90077741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 387
Semi-minor axis of confidence ellipse (meter) 230
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 73
Circular confidence region, given by single value of horizontal uncertainty (meter) 390.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 63
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.51261
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 11
Magnitude information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 90077741
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-14 07:19:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CESI.HHE. 2021-04-18T04:16:11.00 0.6 undecidable manual S 316 41.5251 50 0.22 46
IV.LAV9.HHZ. 2021-04-18T04:16:10.92 3.0 undecidable manual P -0.33 0
IV.VIVA.HHZ. 2021-04-18T04:16:10.47 3.0 negative manual P 0.36 0
IV.MOMA.HNZ. 2021-04-18T04:16:07.24 0.6 undecidable manual P 278 56.8986 50 -0.16 45
IV.TERO.HHN. 2021-04-18T04:16:07.78 0.6 undecidable manual S 115 30.6471 50 -0.09 48
IV.RM33.HNZ. 2021-04-18T04:16:06.38 0.6 undecidable manual S 189 25.752 50 -0.18 48
IV.LNSS.HNZ. 2021-04-18T04:16:05.88 0.6 undecidable manual S 230 23.5542 50 -0.1 49
IV.MC2.EHZ. 2021-04-18T04:16:05.19 0.6 undecidable manual S 343 20.1687 50 0.11 49
IV.CESI.HHE. 2021-04-18T04:16:05.48 0.6 undecidable manual P 316 41.5251 50 0.45 44
IV.MMO1.EHZ. 2021-04-18T04:16:04.61 0.3 undecidable manual S 16 18.6702 120 -0.05 75
IV.TERO.HHN. 2021-04-18T04:16:03.56 0.1 undecidable manual P 115 30.6471 50 0.2 94
IV.NRCA.HHZ. 2021-04-18T04:16:03.66 0.6 undecidable manual S 311 16.0728 124 -0.24 48
IV.LNSS.HNZ. 2021-04-18T04:16:02.10 0.6 undecidable manual P 230 23.5542 50 -0.16 48
IV.T1299.EHZ. 2021-04-18T04:16:02.80 0.6 undecidable manual S 172 11.5773 133 0.11 50
IV.SMA1.EHZ. 2021-04-18T04:16:02.99 0.3 undecidable manual S 154 13.2756 129 -0.14 74
IV.MTRA.HNZ. 2021-04-18T04:16:02.37 0.6 undecidable manual S 79 11.0778 134 -0.19 49
IV.RM33.HNZ. 2021-04-18T04:16:02.45 0.1 undecidable manual P 189 25.752 50 -0.15 96
IV.NRCA.HHZ. 2021-04-18T04:16:01.10 0.1 undecidable manual P 311 16.0728 124 0.04 100
IV.MC2.EHZ. 2021-04-18T04:16:01.58 0.1 undecidable manual P 343 20.1687 50 -0.16 97
IV.MMO1.EHZ. 2021-04-18T04:16:01.52 0.3 undecidable manual P 16 18.6702 120 0.02 75
IV.SMA1.EHZ. 2021-04-18T04:16:00.82 0.3 positive manual P 154 13.2756 129 0.2 73
IV.MTRA.HNZ. 2021-04-18T04:16:00.16 0.1 undecidable manual P 79 11.0778 134 -0.12 99
IV.T1299.EHZ. 2021-04-18T04:16:00.67 0.1 undecidable manual P 172 11.5773 133 0.31 95
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:0.6 0.000034750000000000004 0.14 AML other m 2021-04-18T04:16:03.77
IV.NRCA.HHN. ML:0.7 0.000040300000000000004 0.12 AML other m 2021-04-18T04:16:03.83
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