Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 12-05-2021 and time 16:22:04 (UTC) in region 4 km SE Accumoli (RI)

A magnitude ML 1.4 earthquake occured in region: 4 km SE Accumoli (RI), on

  • 12-05-2021 16:22:04 (UTC)
  • 12-05-2021 18:22:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6720, 13.2890 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 4 667 667
Amatrice RI 5 2657 3324
Arquata del Tronto AP 11 1178 4502
Cittareale RI 12 482 4984
Campotosto AQ 14 542 5526
Acquasanta Terme AP 15 2916 8442
Montereale AQ 17 2581 11023
Capitignano AQ 17 665 11688
Valle Castellana TE 19 977 12665
Cortino TE 19 656 13321
Montegallo AP 19 523 13844
Rocca Santa Maria TE 20 537 14381

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km W of Teramo (54892 inhabitants)
37 Km N of L'Aquila (69753 inhabitants)
54 Km E of Terni (111501 inhabitants)
57 Km SE of Foligno (57155 inhabitants)
73 Km W of Montesilvano (53738 inhabitants)
79 Km W of Pescara (121014 inhabitants)
80 Km W of Chieti (51815 inhabitants)
88 Km NE of Guidonia Montecelio (88673 inhabitants)
88 Km SE of Perugia (166134 inhabitants)
88 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 1.4 2021-05-12
16:22:04		 42.6722 13.2887 12 2021-12-29
11:12:07		 Bollettino Sismico Italiano INGV 91806901
Reviewed
Rev100 		ML 1.5 2021-05-12
16:22:04		 42.6772 13.2858 12 2021-05-12
16:32:00		 Sala Sismica INGV-Roma 90028561
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-12 16:22:04 ± 0.05
Latitude 42.6722 ± 0.0027
Longitude 13.2887 ± 0.0049
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 91806901

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 310
Semi-minor axis of confidence ellipse (meter) 259
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 272
Circular confidence region, given by single value of horizontal uncertainty (meter) 310.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 59
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) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.29048
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.1
Num. used stations 16
Type of magnitude ML
Reference to an origin 91806901
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-08 14:49:31

ML:1.5

Field Value
Value 1.5
Uncertainty 0.1
Num. used stations 12
Type of magnitude ML
Reference to an origin 90028561
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-12 16:32:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MCIV.CHZ. 2021-05-12T16:22:41.43 3.0 undecidable manual S -0.05 0
IV.LAV9.HNZ. 2021-05-12T16:22:38.85 3.0 undecidable manual S -0.21 0
IV.ARVD.HHZ. 2021-05-12T16:22:29.65 3.0 undecidable manual S -3.57 0
IV.GAVE.EHZ. 2021-05-12T16:22:15.00 0.6 undecidable manual S 274 32.2455 93 -0.21 46
IV.MC2.EHZ. 2021-05-12T16:22:14.44 0.6 undecidable manual S 343 27.75 93 0.43 44
IV.TERO.HHZ. 2021-05-12T16:22:13.40 0.6 undecidable manual S 102 26.2515 94 -0.23 46
IV.MMO1.EHZ. 2021-05-12T16:22:13.32 0.6 undecidable manual S 7 25.3524 94 -0.06 48
IV.LNSS.HHZ. 2021-05-12T16:22:12.33 0.6 undecidable manual S 249 21.6672 96 -0.06 49
IV.NRCA.HHZ. 2021-05-12T16:22:12.32 0.6 undecidable manual S 322 22.8549 95 -0.39 45
IV.CAMP.HHZ. 2021-05-12T16:22:11.37 0.3 undecidable manual S 147 18.0708 99 -0.06 73
IV.RM33.HNZ. 2021-05-12T16:22:11.58 0.3 undecidable manual S 199 19.0698 98 -0.13 72
IV.MC2.EHZ. 2021-05-12T16:22:10.11 0.3 undecidable manual P 343 27.75 93 0.27 68
IV.GAVE.EHZ. 2021-05-12T16:22:10.43 0.1 undecidable manual P 274 32.2455 93 -0.1 94
IV.MMO1.EHZ. 2021-05-12T16:22:09.57 0.3 undecidable manual P 7 25.3524 94 0.09 71
IV.NRCA.HHZ. 2021-05-12T16:22:09.01 0.1 positive manual P 322 22.8549 95 -0.08 96
IV.MTRA.EHZ. 2021-05-12T16:22:09.80 0.1 undecidable manual S 43 12.876 114 -0.3 92
IV.TERO.HHZ. 2021-05-12T16:22:09.60 0.1 undecidable manual P 102 26.2515 94 -0.01 96
IV.T1299.HNZ. 2021-05-12T16:22:08.47 0.1 undecidable manual S 187 4.1958 155 0.01 100
IV.SMA1.EHZ. 2021-05-12T16:22:08.59 0.1 undecidable manual S 140 5.994 145 -0.1 97
IV.CAMP.HHZ. 2021-05-12T16:22:08.48 0.3 undecidable manual P 147 18.0708 99 0.13 72
IV.LNSS.HHZ. 2021-05-12T16:22:08.92 0.1 positive manual P 249 21.6672 96 0.02 97
IV.RM33.HNZ. 2021-05-12T16:22:08.60 0.3 undecidable manual P 199 19.0698 98 0.09 72
IV.MTRA.EHZ. 2021-05-12T16:22:07.66 0.1 undecidable manual P 43 12.876 114 0.08 98
IV.SMA1.EHZ. 2021-05-12T16:22:06.97 0.1 negative manual P 140 5.994 145 0.2 97
IV.T1299.HNZ. 2021-05-12T16:22:06.88 0.1 negative manual P 187 4.1958 155 0.25 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:1.6 0.0005250000000000001 0.16 AML other m 2021-05-12T16:22:08.68
IV.SMA1.EHE. ML:1.4 0.000384 0.12 AML other m 2021-05-12T16:22:08.68
IV.MTRA.EHN. ML:1.6 0.00035456215 0.4992 AML other m 2021-05-12T16:22:10.15
IV.MTRA.HNN. ML:1.5 0.0002936641 0.4864 AML other m 2021-05-12T16:22:10.15
IV.MTRA.EHE. ML:1.6 0.0003962136 0.3072 AML other m 2021-05-12T16:22:10.34
IV.MTRA.HNE. ML:1.6 0.00039749999999999996 0.3 AML other m 2021-05-12T16:22:10.19
IV.LNSS.HHE. ML:1.4 0.0001825 0.14 AML other m 2021-05-12T16:22:12.55
IV.NRCA.HHE. ML:1.4 0.000162 0.14 AML other m 2021-05-12T16:22:12.55
IV.NRCA.HNE. ML:1.4 0.00015150544749999997 0.1536 AML other m 2021-05-12T16:22:12.55
IV.LNSS.HNE. ML:1.5 0.00019563169999999998 0.1664 AML other m 2021-05-12T16:22:12.47
IV.LNSS.HHN. ML:1.4 0.00016 0.32 AML other m 2021-05-12T16:22:12.61
IV.LNSS.HNN. ML:1.4 0.00017117065 0.32 AML other m 2021-05-12T16:22:12.61
IV.NRCA.HHN. ML:1.1 0.00008562316 0.1408 AML other m 2021-05-12T16:22:12.61
IV.NRCA.HNN. ML:1.3 0.000123813015 0.1792 AML other m 2021-05-12T16:22:12.69
IV.GAVE.EHE. ML:1.3 0.00008001377 0.1792 AML other m 2021-05-12T16:22:15.69
IV.GAVE.EHN. ML:1.3 0.00009719999999999999 1.16 AML other m 2021-05-12T16:22:15.89
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