Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 21-05-2021 and time 19:26:15 (Italy) in region 7 km W Arquata del Tronto (AP)

A magnitude ML 0.8 earthquake occured in region: 7 km W Arquata del Tronto (AP), on

  • 21-05-2021 17:26:15 (UTC)
  • 21-05-2021 19:26:15 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7920, 13.2210 at 10 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
Arquata del Tronto AP 7 1178 1178
Norcia PG 10 4957 6135
Montegallo AP 11 523 6658
Accumoli RI 11 667 7325
Castelsantangelo sul Nera MC 13 281 7606
Montemonaco AP 15 604 8210
Acquasanta Terme AP 16 2916 11126
Preci PG 18 724 11850
Ussita MC 18 444 12294
Cascia PG 19 3217 15511
Amatrice RI 19 2657 18168
Visso MC 19 1107 19275
Montefortino FM 20 1178 20453
Cittareale RI 20 482 20935

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km W of Teramo (54892 inhabitants)
46 Km E of Foligno (57155 inhabitants)
51 Km N of L'Aquila (69753 inhabitants)
53 Km E of Terni (111501 inhabitants)
76 Km E of Perugia (166134 inhabitants)
82 Km W of Montesilvano (53738 inhabitants)
89 Km W of Pescara (121014 inhabitants)
92 Km NW of Chieti (51815 inhabitants)
95 Km S of Ancona (100861 inhabitants)
97 Km NE of Guidonia Montecelio (88673 inhabitants)
98 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 0.8 2021-05-21
17:26:15		 42.7918 13.2212 10 2021-12-29
11:12:12		 Bollettino Sismico Italiano INGV 92992811
Reviewed
Rev100 		ML 1.8 2021-05-21
17:26:15		 42.7987 13.2212 12 2021-05-21
17:35:16		 Sala Sismica INGV-Roma 90343241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-21 17:26:15 ± 0.05
Latitude 42.7918 ± 0.0036
Longitude 13.2212 ± 0.0049
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 92992811

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 348
Semi-minor axis of confidence ellipse (meter) 348
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 41
Circular confidence region, given by single value of horizontal uncertainty (meter) 350.0
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 25
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.32825
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.3
Num. used stations 9
Type of magnitude ML
Reference to an origin 92992811
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-07-20 17:03:41

ML:1.8

Field Value
Value 1.8
Uncertainty 0.0
Num. used stations 2
Type of magnitude ML
Reference to an origin 90343241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-21 17:35:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SENI.HNZ. 2021-05-21T17:26:43.25 3.0 undecidable manual S -0.04 0
IV.CPGN.EHZ. 2021-05-21T17:26:37.01 3.0 undecidable manual P 2.75 0
IV.SENI.HNZ. 2021-05-21T17:26:32.83 3.0 undecidable manual Pg 2.42 0
IV.TERO.HHZ. 2021-05-21T17:26:28.24 0.3 undecidable manual S 121 36.4413 50 0.13 70
IV.GAVE.HNZ. 2021-05-21T17:26:26.15 0.3 undecidable manual S 248 28.8489 50 0.06 72
IV.RM33.HNE. 2021-05-21T17:26:26.84 0.3 undecidable manual S 181 31.3464 50 0.07 72
IV.MF5.EHZ. 2021-05-21T17:26:26.46 0.6 undecidable manual S 42 29.1486 50 0.3 46
IV.FDMO.HHZ. 2021-05-21T17:26:25.67 0.3 undecidable manual S 338 29.2485 50 -0.52 66
IV.LNSS.HHZ. 2021-05-21T17:26:25.31 0.3 undecidable manual S 215 25.6521 50 0.08 73
IV.SMA1.EHZ. 2021-05-21T17:26:23.72 0.6 undecidable manual S 152 20.1687 117 0.08 49
IV.MF5.EHZ. 2021-05-21T17:26:22.18 0.3 undecidable manual P 42 29.1486 50 0.41 67
IV.TERO.HHZ. 2021-05-21T17:26:22.79 0.3 undecidable manual P 121 36.4413 50 -0.1 71
IV.RM33.HNE. 2021-05-21T17:26:22.34 0.6 undecidable manual P 181 31.3464 50 0.22 47
IV.MTRA.EHZ. 2021-05-21T17:26:22.07 0.3 undecidable manual S 105 14.7741 125 0.03 75
IV.MC2.EHZ. 2021-05-21T17:26:21.82 0.3 undecidable manual S 349 13.4754 127 0.14 73
IV.FDMO.HHZ. 2021-05-21T17:26:21.61 0.3 undecidable manual P 338 29.2485 50 -0.18 71
IV.GAVE.HNZ. 2021-05-21T17:26:21.68 0.3 undecidable manual P 248 28.8489 50 -0.05 73
IV.MMO1.EHZ. 2021-05-21T17:26:21.90 0.3 undecidable manual S 36 14.6742 125 -0.11 74
IV.LNSS.HHZ. 2021-05-21T17:26:21.11 0.3 undecidable manual P 215 25.6521 50 -0.12 72
IV.NRCA.HHZ. 2021-05-21T17:26:20.80 0.3 undecidable manual S 298 9.879 136 0.07 75
IV.MTRA.EHZ. 2021-05-21T17:26:19.02 0.6 undecidable manual P 105 14.7741 125 -0.37 46
IV.SMA1.EHZ. 2021-05-21T17:26:19.55 0.6 undecidable manual P 152 20.1687 117 -0.76 40
IV.MC2.EHZ. 2021-05-21T17:26:19.28 0.1 undecidable manual P 349 13.4754 127 0.1 98
IV.MMO1.EHZ. 2021-05-21T17:26:19.36 0.1 undecidable manual P 36 14.6742 125 -0.01 100
IV.NRCA.HHZ. 2021-05-21T17:26:18.81 0.1 undecidable manual P 298 9.879 136 0.18 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.7 0.000696 0.08 AML other m 2021-05-21T17:26:20.90
IV.NRCA.HHN. ML:1.8 0.0007505 0.08 AML other m 2021-05-21T17:26:20.95
IV.MTRA.EHE. ML:0.9 0.00007011273 0.128 AML other m 2021-05-21T17:26:22.43
IV.MTRA.EHN. ML:0.7 0.000046680804999999996 0.128 AML other m 2021-05-21T17:26:22.49
IV.MTRA.HNE. ML:0.9 0.00006846159000000001 0.1024 AML other m 2021-05-21T17:26:22.44
IV.MTRA.HNN. ML:0.6 0.000036043535000000004 0.0896 AML other m 2021-05-21T17:26:22.58
IV.FDMO.HHE. ML:0.5 0.000013033217499999999 0.1152 AML other m 2021-05-21T17:26:26.06
IV.FDMO.HHN. ML:0.7 0.0000244653 0.2048 AML other m 2021-05-21T17:26:25.84
IV.TERO.HHN. ML:0.6 0.0000130413975 0.0768 AML other m 2021-05-21T17:26:29.14
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