JPS5834791B2 - Earthquake telemeter method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention improves the transmission of earthquake motion by limiting the type of information to be transmitted among various information on earthquake motion to the extent necessary to determine the epicenter and magnitude of the earthquake. This paper relates to an earthquake telemeter system that saves the number of lines required or makes effective use of low-quality lines.

A typical example of a conventional seismic telemeter system is shown in Figure 1.

Figure 1 shows a case where there are three observation points, and one of them is used as a base to transmit seismic motion to a base station.

In FIG. 1, 1a to 3a are observation points provided in the observation area, and 1a also serves as a base directly connected to a base station.

4a is a base station located in an area remote from the observation area.

Lines 5a to 7a transmit seismic motion signals.

The observation area where observation points 1a to 3b are provided is usually an inconvenient remote mountain area and is uninhabited in order to avoid the effects of constant tremors.

On the other hand, the base station 4a is also where an organization that requires information regarding earthquakes is located, and is usually installed at a sub-site.

Therefore, the line 7a between the observation point 1a and the base station 43 tends to have a longer distance.

The seismic motion signal that must be transmitted through the line 7a is a total of nine components of the three components of the vertical motion, north-south motion, and east-west motion of the earthquake motion obtained at each of the observation points 13 to 3a.

-For example, one telephone line can transmit 3 Fy of seismic motion.

According to this example, line 7a requires three lines.

If three long-distance lines such as the line 7a are required, it may be difficult to secure the number of lines.

Or, even if you manage to secure one, there are drawbacks such as the expense increasing and making it impossible to maintain it.

The purpose of the present invention is to eliminate these drawbacks by reducing the number of telemeter lines by limiting the content of the seismic motion to be transmitted to the extent that the purpose of earthquake observation can be achieved.This will be described in detail below. explain.

FIGS. 2 and 3 show a first embodiment of the present invention, in which the number of observation points is three.

FIG. 2 is a diagram corresponding to FIG. 1 explaining the conventional method, in which 1 is an observation point based in the observation area (hereinafter referred to as an observation base), 2 and 3 are observation points, 4 is a base station, 5
7 to 7 are telemeter transmission lines, and 8 is a telecontrol transmission line.

Figure 3 shows observation base 1, observation points 2 and 3. It is a diagram showing the inside of the base station 4, in which 9 is a seismometer vertical motion converter (hereinafter referred to as a converter), 10 is a seismometer vertical motion converter (hereinafter referred to as an N converter), and 11 is a seismometer vertical motion converter. Converter (hereinafter referred to as E converter)
, 12 is a signal conditioner (hereinafter referred to as a regulator), 13 is a feeder,
14 is a receiver, 15 is a switch, 16 is a feeder, 17 is a receiver, 18 is a processing device, 19 is a control signal transmitter, and 20 is a control signal receiver.

Next, the operation of the first embodiment will be explained.

At observation points 2 and 3, seismic motion is detected by converter 9, N converter 10, and E converter 11, converted into an electrical signal, subjected to signal adjustment such as amplification and filtering by regulator 12, and transmitted. The signal is modulated by the quantizer 13 so that it can be sent to the transmission line.

The output of the meter 13 at observation point 2 is transmitted through the transmission line 5, and the output of the meter 13 at observation point 3 is transmitted through the transmission line 6.
It is sent to the receiver 14 of the observation base 1.

At observation base 1, in addition to the ground motion signals sent from observation points 2 and 3, the ground motion at observation base 1 is detected by converter 9, N converter 10, and E converter 11; You can also obtain the signal adjusted by .

The receiver 14 of the observation base 1 demodulates the modulated signals from the observation points 1 and 2 and supplies the ground motion signal to the switch 15.

The ground motion signal at observation base 1 is also transferred from regulator 12 to switch 1.
5.

The input of the switch 15 is constantly supplied with 3 fii minutes of vertical motion, north-south motion, and east-west motion of the ground motion of observation base 1, observation points 2 and 3, for a total of 9 minutes.

The switch 15 normally sends three vertical motion components (vertical motion components between observation base 1 and observation points 2 and 3) to the feeder 16.

The transmitter 16 modulates the signal so that it can be sent to the transmission line.

This modulated signal is sent to the base station 4 through the transmission line 7, demodulated by the receiver 17, and guided to the processing device 18.

The processing device 18 performs various judgments, records, etc. regarding earthquake motion.

The input to the processing device 18 is always from observation base 1, observation point 2,
Since this is the vertical motion component of the ground motion signal in step 3, when an earthquake occurs and seismic waves reach this observation network, the amplitude of the vertical motion component of the ground motion signal due to the initial motion will increase within the time determined by the thickness of the observation network. increases all at once.

The processing device 18 constantly monitors signs of such an earthquake, and if it is determined to be an earthquake, measures the time of onset, push/pull, amplitude, period, etc. for each vertical motion component.

Once these are removed, there is no need to continue monitoring the vertical motion component for the purpose of measuring the seismic source and magnitude. The signal is sent to the control signal receiver 20 of the observation base 1 via the control signal receiver 20 of the observation base 1.

When the control signal receiver 20 supplies the ■H switching signal to the switch 15, the switch 15 changes from the previous three vertical motion components to the horizontal motion 6e.

It is then switched to minutes and sent to the feeder 16.

Since the feeder 16 changes the conventional three-component input into six-component manual input, the modulation content is switched internally.

Since the number of components is doubled, the maximum transmission frequency for vertical motion component transmission is approximately 1 for horizontal motion component transmission.
/2.

After switching, the base station 4 is transmitted from the data transmitter 16 via the transmission line 7.
The six horizontal motions are transmitted to the receiver 17.

Receiving the seismic motion signal of six horizontal motion components from the receiver 17, the processing device 18 generates an H-V switching signal by measuring the S wave generation time, S liquid volume large amplitude, period, and earthquake end time, The switching device 15 is driven via the control signal transmitter 19, the transmission line 8, and the control signal receiver 20, and the normal vertical three-component transmission is restored.

In the first embodiment described above, since the observation network consisting of the observation base 1 and observation points 2 and 3 has a width of several hundred to several thousand winds on one side, the transmission line 5 or 6 may be privately operated. If it is possible and an existing dedicated line can be used, this may be used.

On the other hand, the transmission lines 7 and 8 connecting the observation base 1 and the base station 4 generally have longer distances.

-As an example, the numbers range from tens to hundreds.

It is extremely inefficient both economically and socially to provide such long-distance private lines, as well as to use a large number of existing dedicated lines.

In the first embodiment, the number of long-distance transmission lines can be reduced from three to two, as explained above.

If we look at such long-distance transmission lines in terms of telephone lines,
Since it is basically a 4-wire system, the transmission lines 7 and 8 in the first embodiment should not be counted as 2 lines, but as 4 lines.
It should be a single wire system.

Therefore, the method of the present invention has the advantage of being able to reduce the number of long-distance transmission lines, which would require three lines in the conventional system, to (2) lines.

In the first embodiment described so far, at the observation base 1, the vertical motion component is always transmitted, and the switching signal from the base station is used to switch to the north-south motion component and the east-west motion component. As shown in FIG. 4, it is also possible to configure the observation base 1 to switch to only the north-south motion component and send it out.

In general, it is rare for an earthquake motion to have no north-south motion component and only have an east-west motion component.

On the other hand, it does not completely lack an east-west dynamic component.

Therefore, even with this configuration, it is possible to transmit the vertical motion component at all times and the horizontal motion component at the time of switching, producing the same effect as the first embodiment and further reducing the number of transmission lines.

Also, the same effect can be obtained by using east-west motion time instead of north-south motion time.

As a third embodiment, as shown in Fig. 5, observation base 1
, the N converter 10 is converted by the square root circuit 22
It is also possible to create an absolute value of the square root of the sum of the square of the output of the E-converter 11 and the square of the output of the E converter 11, and send this as the horizontal motion component while switching to the vertical motion component.

Since the processing device 18 of the base station 4 also performs the same processing as the square root circuit to obtain the magnitude, there is no problem in processing this before transmission.

Another piece of information we are trying to obtain from horizontal motion is the time of shear wave oscillation, but this is also clearer from the sum-of-squares root circuit output than from looking at each component of the horizontal motion.

The present invention has the advantage of reducing the number of transmission lines because the vertical motion component and horizontal motion component are switched and transmitted in a timely manner in the signal transmission of seismic motion. can be used economically.

[Brief explanation of drawings]

Figure 1 is an observation network diagram explaining the conventional earthquake telemeter system, Figure 2 is an observation network diagram explaining the earthquake telemeter system of the present invention, Figure 3, Figures 4 and 5 are detailed explanations of the present invention. It is a diagram. 1...Observation base, 2,3...Observation point,
4...Base station, 5-7...Transmission line for telemeter, 8...Transmission line for telecontrol, 9...■Converter, 10. ...N converter, 11...E converter, 12...signal conditioner, 13...feeder, 14...receiver Quantity meter, 15... Switching device, 16... Feeding device, 17... Receiving device, 18... Processing device, 19...・Control signal transmitter, 20...
Control signal receiver, 21...Switcher, 22...
・・・Square peace root circuit.

Claims (1)

[Scope of Claims] 1 Earthquake information at a large number of observation points provided in a predetermined observation area is provided at a point remote from the predetermined observation area via a predetermined observation point or a separate observation base. In the telemetry method, the base station always monitors the vertical motion component of the observation point, and if the occurrence of an earthquake is detected by the vertical motion component, the base station transmits the vertical motion component to the observation point. An earthquake telemeter system characterized by sending out a switching signal that stops sending out and starts sending out horizontal motion components. 2. The earthquake telemeter method according to claim 1, characterized in that a north-south motion component or an east-west motion component is used as the horizontal motion component. 3. Claim 1 is characterized in that the horizontal motion component is the square root of the sum of the square of the value of the north-south motion component and the square of the value of the east-west motion component. Earthquake telemeter method.