Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 16-04-2021 and time 10:58:33 (UTC) in region 5 km E Accumoli (RI)

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

  • 16-04-2021 10:58:33 (UTC)
  • 16-04-2021 12:58:33 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6980, 13.3090 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
Amatrice RI 8 2657 3324
Arquata del Tronto AP 8 1178 4502
Acquasanta Terme AP 12 2916 7418
Cittareale RI 15 482 7900
Valle Castellana TE 16 977 8877
Montegallo AP 16 523 9400
Campotosto AQ 16 542 9942
Rocca Santa Maria TE 18 537 10479
Cortino TE 18 656 11135
Capitignano AQ 20 665 11800
Montereale AQ 20 2581 14381

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km W of Teramo (54892 inhabitants)
39 Km N of L'Aquila (69753 inhabitants)
56 Km E of Terni (111501 inhabitants)
57 Km SE of Foligno (57155 inhabitants)
72 Km W of Montesilvano (53738 inhabitants)
79 Km W of Pescara (121014 inhabitants)
80 Km W of Chieti (51815 inhabitants)
88 Km SE of Perugia (166134 inhabitants)
91 Km NE of Guidonia Montecelio (88673 inhabitants)
92 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 1.1 2021-04-16
10:58:33		 42.6983 13.3092 12 2021-07-12
16:55:08		 Bollettino Sismico Italiano INGV 89490921
Reviewed
Rev100 		ML 1.1 2021-04-16
10:58:33		 42.6948 13.3078 13 2021-04-16
11:07:08		 Sala Sismica INGV-Roma 89143241
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-16 10:58:33 ± 0.09
Latitude 42.6983 ± 0.0045
Longitude 13.3092 ± 0.0061
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 89490921

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 460
Semi-minor axis of confidence ellipse (meter) 266
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 242
Circular confidence region, given by single value of horizontal uncertainty (meter) 460.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 61
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
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) 0.06655
Epicentral distance of station farthest from the epicenter (degree) 0.30937
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 89143241
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-16 11:07:08

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 89490921
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-26 12:46:30
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GAVE.EHZ. 2021-04-16T10:58:45.21 0.3 undecidable manual S 269 33.8439 92 0.08 72
IV.TERO.HHZ. 2021-04-16T10:58:42.67 0.3 undecidable manual S 109 25.4523 94 -0.22 71
IV.MMO1.EHZ. 2021-04-16T10:58:42.08 0.1 undecidable manual S 4 22.3554 96 0.01 100
IV.NRCA.HHZ. 2021-04-16T10:58:41.56 0.3 undecidable manual S 313 21.867 96 -0.37 71
IV.MF5.EHN. 2021-04-16T10:58:40.66 0.3 undecidable manual P 21 34.3434 92 0.31 69
IV.GAVE.EHZ. 2021-04-16T10:58:39.99 0.1 undecidable manual P 269 33.8439 92 -0.28 93
IV.T1299.HNN. 2021-04-16T10:58:38.66 0.6 undecidable manual S 197 7.3815 138 0.23 50
IV.MTRA.EHZ. 2021-04-16T10:58:38.75 0.1 undecidable manual S 48 9.5793 128 -0.11 100
IV.SMA1.EHZ. 2021-04-16T10:58:38.34 0.1 undecidable manual S 164 7.7811 136 -0.16 98
IV.TERO.HHZ. 2021-04-16T10:58:38.86 0.1 undecidable manual P 109 25.4523 94 -0.12 97
IV.MMO1.EHZ. 2021-04-16T10:58:38.59 0.1 undecidable manual P 4 22.3554 96 0.09 98
IV.LNSS.HNZ. 2021-04-16T10:58:38.65 0.6 undecidable manual P 244 24.3534 95 -0.16 48
IV.NRCA.HHZ. 2021-04-16T10:58:38.33 0.1 positive manual P 313 21.867 96 -0.1 99
IV.T1299.HNN. 2021-04-16T10:58:36.73 0.1 undecidable manual P 197 7.3815 138 0.33 97
IV.MTRA.EHZ. 2021-04-16T10:58:36.85 0.1 negative manual P 48 9.5793 128 0.2 99
IV.SMA1.EHZ. 2021-04-16T10:58:36.71 0.1 undecidable manual P 164 7.7811 136 0.27 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TERO.HNN. ML:1.4 0.0001335389 0.64 AML other m 2021-04-16T10:58:38.27
IV.SMA1.EHN. ML:1.0 0.000126306645 0.096 AML other m 2021-04-16T10:58:38.68
IV.SMA1.EHE. ML:1.0 0.000119000895 0.1152 AML other m 2021-04-16T10:58:38.75
IV.MTRA.HNN. ML:0.8 0.000082101395 0.288 AML other m 2021-04-16T10:58:39.06
IV.MTRA.EHN. ML:0.6 0.000045591825 0.1216 AML other m 2021-04-16T10:58:39.41
IV.MTRA.HNE. ML:1.0 0.00010846060499999998 0.3712 AML other m 2021-04-16T10:58:42.44
IV.MTRA.EHE. ML:0.8 0.00007385877 0.3584 AML other m 2021-04-16T10:58:42.62
IV.NRCA.HHN. ML:1.1 0.00008999999999999999 0.1 AML other m 2021-04-16T10:58:42.54
IV.TERO.HHE. ML:0.9 0.000043349999999999997 0.12 AML other m 2021-04-16T10:58:42.84
IV.NRCA.HNE. ML:1.1 0.000089051265 1.7952 AML other m 2021-04-16T10:58:43.04
IV.NRCA.HHE. ML:1.1 0.00009154999999999999 0.14 AML other m 2021-04-16T10:58:43.09
IV.TERO.HHN. ML:0.9 0.000042172935 0.0768 AML other m 2021-04-16T10:58:43.29
IV.GAVE.EHN. ML:1.0 0.000038903185 0.1408 AML other m 2021-04-16T10:58:45.48
IV.GAVE.EHE. ML:0.9 0.00003444481 0.256 AML other m 2021-04-16T10:58:46.05
IV.TERO.HNE. ML:1.2 0.00010033704 0.5504 AML other m 2021-04-16T10:58:47.49
IV.GAVE.HNE. ML:1.4 0.00010089040499999999 1.4048 AML other m 2021-04-16T10:58:47.74
IV.NRCA.HNN. ML:1.6 0.00023391689999999998 0.9376 AML other m 2021-04-16T10:58:48.50
IV.GAVE.HNN. ML:1.7 0.00022530650000000002 0.816 AML other m 2021-04-16T10:58:55.46
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