Earthquake with magnitude of ML 0.7 on date 16-05-2021 and time 14:51:50 (Italy) in region 3 km NE Monterotondo Marittimo (GR)

A magnitude ML 0.7 earthquake occured in region: 3 km NE Monterotondo Marittimo (GR), on

  • 16-05-2021 12:51:50 (UTC)
  • 16-05-2021 14:51:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.171, 10.868 at 7 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Monterotondo Marittimo GR 3 1371 1371
Castelnuovo di Val di Cecina PI 5 2231 3602
Monteverdi Marittimo PI 12 758 4360
Montieri GR 13 1204 5564
Massa Marittima GR 13 8375 13939
Pomarance PI 15 5897 19836
Radicondoli SI 17 914 20750
Chiusdino SI 18 1903 22653
Suvereto LI 18 3072 25725
Sassetta LI 19 514 26239

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km W of Siena (53903 inhabitants)
50 Km NW of Grosseto (82087 inhabitants)
62 Km SE of Livorno (159219 inhabitants)
70 Km SW of Scandicci (50609 inhabitants)
71 Km SE of Pisa (89158 inhabitants)
74 Km SW of Firenze (382808 inhabitants)
81 Km SE of Lucca (89046 inhabitants)
81 Km S of Prato (191150 inhabitants)
85 Km S of Pistoia (90315 inhabitants)
89 Km W of Arezzo (99543 inhabitants)
92 Km SE of Viareggio (62467 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 0.7 2021-05-16
12:51:50
43.1708 10.8678 7 2021-05-16
13:05:15
Sala Sismica INGV-Roma 90165041
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-05-16 12:51:50 ± 0.16
Latitude 43.1708 ± 0.0117
Longitude 10.8678 ± 0.0160
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 90165041

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1663
Semi-minor axis of confidence ellipse (meter) 567
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 225
Circular confidence region, given by single value of horizontal uncertainty (meter) 1660
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 148
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.06115
Epicentral distance of station farthest from the epicenter (degree) 0.65291
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.4
Num. used stations 2
Type of magnitude ML
Reference to an origin 90165041
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-05-16 13:05:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
TV.SF13.HHE. 2021-05-16T12:52:03.57 0.3 undecidable manual P 122 0.6529 50 0.14 67
IV.RIBO.EHZ.01 2021-05-16T12:52:00.13 0.3 undecidable manual S 149 0.2572 104 -0.41 69
IV.MAGO.CHZ. 2021-05-16T12:51:57.50 0.3 undecidable manual S 304 0.1844 109 -0.32 71
IV.RIBO.EHZ.01 2021-05-16T12:51:56.21 0.1 undecidable manual P 149 0.2572 104 -0.01 100
IV.FROS.CHZ. 2021-05-16T12:51:55.15 0.3 undecidable manual P 79 0.214 107 -0.14 74
IV.MAGO.CHZ. 2021-05-16T12:51:54.85 0.1 undecidable manual P 304 0.1844 109 0.19 98
IV.TRIF.CHZ. 2021-05-16T12:51:53.83 0.3 undecidable manual S 156 0.0612 136 0.09 77
IV.TRIF.CHZ. 2021-05-16T12:51:52.57 0.1 undecidable manual P 156 0.0612 136 0.27 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.TRIF.CHE. ML:1.4 0.0001205 0.68 AML other m 2021-05-16T12:51:53.94
IV.TRIF.CHN. ML:1.2 8.965E-5 0.6 AML other m 2021-05-16T12:51:54.16
IV.MAGO.CHE. ML:0.4 2.1919465E-5 0.096 AML other m 2021-05-16T12:51:57.68
IV.MAGO.CHN. ML:1 7.095911E-5 1.4016 AML other m 2021-05-16T12:51:57.88
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