Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.6 on date 18-03-2021 and time 03:16:23 (Italy) in region 5 km NE Accumoli (RI)

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

  • 18-03-2021 02:16:23 (UTC)
  • 18-03-2021 03:16:23 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7260, 13.2860 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
Accumoli RI 5 667 667
Arquata del Tronto AP 5 1178 1845
Amatrice RI 11 2657 4502
Acquasanta Terme AP 11 2916 7418
Montegallo AP 14 523 7941
Cittareale RI 16 482 8423
Valle Castellana TE 17 977 9400
Norcia PG 17 4957 14357
Montemonaco AP 20 604 14961
Campotosto AQ 20 542 15503

Municipalities with at least 50000 inhabitants

An earthquake occurred to
35 Km W of Teramo (54892 inhabitants)
43 Km N of L'Aquila (69753 inhabitants)
54 Km E of Foligno (57155 inhabitants)
55 Km E of Terni (111501 inhabitants)
75 Km W of Montesilvano (53738 inhabitants)
81 Km W of Pescara (121014 inhabitants)
83 Km NW of Chieti (51815 inhabitants)
85 Km SE of Perugia (166134 inhabitants)
93 Km NE of Guidonia Montecelio (88673 inhabitants)
94 Km NE of Tivoli (56533 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 2021-03-18
02:16:23		 42.7262 13.2862 12 2021-07-12
16:55:03		 Bollettino Sismico Italiano INGV 88370891
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-03-18 02:16:23 ± 0.07
Latitude 42.7262 ± 0.0036
Longitude 13.2862 ± 0.0073
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 88370891

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 610
Semi-minor axis of confidence ellipse (meter) 40
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 86
Circular confidence region, given by single value of horizontal uncertainty (meter) 610.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 74
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.08633
Epicentral distance of station farthest from the epicenter (degree) 0.29048
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:0.6

Field Value
Value 0.6
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 88370891
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-22 08:49:32
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MF5.EHN. 2021-03-18T02:16:35.83 0.6 undecidable manual S 26 32.2455 93 0.98 36
IV.TERO.HHZ. 2021-03-18T02:16:33.52 0.6 undecidable manual S 114 28.3494 93 -0.28 46
IV.LNSS.HNZ. 2021-03-18T02:16:32.82 0.6 undecidable manual S 236 24.2535 94 0.1 48
IV.RM33.HNZ. 2021-03-18T02:16:32.87 0.6 undecidable manual S 194 24.753 94 0.01 49
IV.MC2.EHZ. 2021-03-18T02:16:32.14 0.6 undecidable manual S 339 22.0668 96 0.02 49
IV.MMO1.EHZ. 2021-03-18T02:16:31.22 0.3 undecidable manual S 10 19.4694 98 -0.23 70
IV.NRCA.HHZ. 2021-03-18T02:16:30.79 0.6 undecidable manual S 310 18.3705 99 -0.37 45
IV.MF5.EHN. 2021-03-18T02:16:30.57 0.3 undecidable manual P 26 32.2455 93 0.4 67
IV.T1299.HNN. 2021-03-18T02:16:29.43 0.6 undecidable manual S 182 10.1787 125 0.3 48
IV.TERO.HHZ. 2021-03-18T02:16:29.36 0.3 undecidable manual P 114 28.3494 93 -0.21 70
IV.SMA1.EHN. 2021-03-18T02:16:29.36 0.6 undecidable manual S 159 11.3775 120 -0.02 50
IV.MTRA.EHZ. 2021-03-18T02:16:28.76 0.3 undecidable manual S 69 9.5793 128 -0.24 71
IV.MC2.EHZ. 2021-03-18T02:16:28.53 0.3 undecidable manual P 339 22.0668 96 -0.07 73
IV.MMO1.EHZ. 2021-03-18T02:16:28.14 0.1 undecidable manual P 10 19.4694 98 -0.07 97
IV.LNSS.HNZ. 2021-03-18T02:16:28.93 0.1 undecidable manual P 236 24.2535 94 -0.01 98
IV.RM33.HNZ. 2021-03-18T02:16:28.97 0.1 undecidable manual P 194 24.753 94 -0.05 97
IV.NRCA.HHZ. 2021-03-18T02:16:27.87 0.1 undecidable manual P 310 18.3705 99 -0.17 95
IV.T1299.HNN. 2021-03-18T02:16:27.13 0.1 undecidable manual P 182 10.1787 125 0.26 95
IV.SMA1.EHN. 2021-03-18T02:16:27.14 0.1 undecidable manual P 159 11.3775 120 0.13 98
IV.MTRA.EHZ. 2021-03-18T02:16:26.84 0.1 positive manual P 69 9.5793 128 0.05 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHE. ML:0.7 0.000057050000000000004 1.14 AML other m 2021-03-18T02:16:28.88
IV.MTRA.EHN. ML:0.5 0.000032550000000000005 1.34 AML other m 2021-03-18T02:16:29.81
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