Earthquake with magnitude of Md 2.6 on date 16-04-1987 and time 17:10:36 (UTC) in region 2 km S Montecatini Val di Cecina (PI)

A magnitude Md 2.6 earthquake occured in region: 2 km S Montecatini Val di Cecina (PI), on

  • 16-04-1987 17:10:36 (UTC)
  • 16-04-1987 19:10:36 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.375, 10.756 at 41 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Montecatini Val di Cecina PI 2 1749 1749
Volterra PI 9 10519 12268
Lajatico PI 11 1336 13604
Montescudaio PI 12 2144 15748
Guardistallo PI 12 1234 16982
Pomarance PI 13 5897 22879
Riparbella PI 13 1603 24482
Casale Marittimo PI 14 1122 25604
Castellina Marittima PI 15 2025 27629
Chianni PI 15 1392 29021
Bibbona LI 17 3175 32196
Terricciola PI 18 4627 36823
Santa Luce PI 19 1684 38507
Peccioli PI 20 4807 43314

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km E of Livorno (159219 inhabitants)
47 Km W of Siena (53903 inhabitants)
48 Km SE of Pisa (89158 inhabitants)
55 Km SW of Scandicci (50609 inhabitants)
56 Km SE of Lucca (89046 inhabitants)
60 Km SW of Firenze (382808 inhabitants)
63 Km SW of Prato (191150 inhabitants)
64 Km S of Pistoia (90315 inhabitants)
68 Km SE of Viareggio (62467 inhabitants)
74 Km NW of Grosseto (82087 inhabitants)
89 Km SE of Massa (69479 inhabitants)
92 Km W of Arezzo (99543 inhabitants)
94 Km SE of Carrara (63133 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
Md 2.6 1987-04-16
17:10:36
43.375 10.756 41 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 44969
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-04-16 17:10:36 ± 0.807
Latitude 43.3750 ± 0.0582
Longitude 10.7560 ± 0.0689
Depth (km) 41 ± 17 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 44969

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 8538.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 231
Number of associated phases, regardless of their use for origin computation 6
Number of defining phases 6
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0.0034
Epicentral distance of station farthest from the epicenter (degree) 0.01433
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

Md:2.6

Field Value
Value 2.6
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 44969
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:44:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.ARV.Z. 1987-04-16T17:11:02.50 10.0 undecidable manual P 84 0.0143 -0.07 1.3
--.ASS.Z. 1987-04-16T17:11:00.50 10.0 undecidable manual P 101 0.0127 0.34 0.9
--.PS9.Z. 1987-04-16T17:10:53.50 10.0 undecidable manual S 333 0.0034 0.16 1
--.PGD.Z. 1987-04-16T17:10:53.00 10.0 undecidable manual P 53 0.0077 0.43 0.9
--.CRE.Z. 1987-04-16T17:10:52.50 10.0 undecidable manual P 73 0.0081 -0.61 0.4
--.PS9.Z. 1987-04-16T17:10:46.20 10.0 undecidable manual P 333 0.0034 -0.17 1.6
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